Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
3448bac3 FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
e6187007 SR |
13 | #include <linux/workqueue.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kthread.h> | |
8434dc93 | 16 | #include <linux/tracefs.h> |
b77e38aa SR |
17 | #include <linux/uaccess.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/ctype.h> | |
49090107 | 20 | #include <linux/sort.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
e6187007 | 22 | #include <linux/delay.h> |
b77e38aa | 23 | |
3fdaf80f SRRH |
24 | #include <trace/events/sched.h> |
25 | ||
020e5f85 LZ |
26 | #include <asm/setup.h> |
27 | ||
91729ef9 | 28 | #include "trace_output.h" |
b77e38aa | 29 | |
4e5292ea | 30 | #undef TRACE_SYSTEM |
b628b3e6 SR |
31 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
32 | ||
20c8928a | 33 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 34 | |
a59fd602 | 35 | LIST_HEAD(ftrace_events); |
9f616680 | 36 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 37 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
d1a29143 SR |
39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
40 | ||
41 | static struct kmem_cache *field_cachep; | |
42 | static struct kmem_cache *file_cachep; | |
43 | ||
6e94a780 SR |
44 | static inline int system_refcount(struct event_subsystem *system) |
45 | { | |
79ac6ef5 | 46 | return system->ref_count; |
6e94a780 SR |
47 | } |
48 | ||
49 | static int system_refcount_inc(struct event_subsystem *system) | |
50 | { | |
79ac6ef5 | 51 | return system->ref_count++; |
6e94a780 SR |
52 | } |
53 | ||
54 | static int system_refcount_dec(struct event_subsystem *system) | |
55 | { | |
79ac6ef5 | 56 | return --system->ref_count; |
6e94a780 SR |
57 | } |
58 | ||
ae63b31e SR |
59 | /* Double loops, do not use break, only goto's work */ |
60 | #define do_for_each_event_file(tr, file) \ | |
61 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
62 | list_for_each_entry(file, &tr->events, list) | |
63 | ||
64 | #define do_for_each_event_file_safe(tr, file) \ | |
65 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 66 | struct trace_event_file *___n; \ |
ae63b31e SR |
67 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
68 | ||
69 | #define while_for_each_event_file() \ | |
70 | } | |
71 | ||
b3a8c6fd | 72 | static struct list_head * |
2425bcb9 | 73 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
74 | { |
75 | if (!event_call->class->get_fields) | |
76 | return &event_call->class->fields; | |
77 | return event_call->class->get_fields(event_call); | |
78 | } | |
79 | ||
b3a8c6fd J |
80 | static struct ftrace_event_field * |
81 | __find_event_field(struct list_head *head, char *name) | |
82 | { | |
83 | struct ftrace_event_field *field; | |
84 | ||
85 | list_for_each_entry(field, head, link) { | |
86 | if (!strcmp(field->name, name)) | |
87 | return field; | |
88 | } | |
89 | ||
90 | return NULL; | |
91 | } | |
92 | ||
93 | struct ftrace_event_field * | |
2425bcb9 | 94 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
95 | { |
96 | struct ftrace_event_field *field; | |
97 | struct list_head *head; | |
98 | ||
e57cbaf0 SRRH |
99 | head = trace_get_fields(call); |
100 | field = __find_event_field(head, name); | |
9f616680 DW |
101 | if (field) |
102 | return field; | |
103 | ||
e57cbaf0 | 104 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
105 | if (field) |
106 | return field; | |
107 | ||
e57cbaf0 | 108 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
109 | } |
110 | ||
8728fe50 LZ |
111 | static int __trace_define_field(struct list_head *head, const char *type, |
112 | const char *name, int offset, int size, | |
113 | int is_signed, int filter_type) | |
cf027f64 TZ |
114 | { |
115 | struct ftrace_event_field *field; | |
116 | ||
d1a29143 | 117 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 118 | if (!field) |
aaf6ac0f | 119 | return -ENOMEM; |
fe9f57f2 | 120 | |
92edca07 SR |
121 | field->name = name; |
122 | field->type = type; | |
fe9f57f2 | 123 | |
43b51ead LZ |
124 | if (filter_type == FILTER_OTHER) |
125 | field->filter_type = filter_assign_type(type); | |
126 | else | |
127 | field->filter_type = filter_type; | |
128 | ||
cf027f64 TZ |
129 | field->offset = offset; |
130 | field->size = size; | |
a118e4d1 | 131 | field->is_signed = is_signed; |
aa38e9fc | 132 | |
2e33af02 | 133 | list_add(&field->link, head); |
cf027f64 TZ |
134 | |
135 | return 0; | |
cf027f64 | 136 | } |
8728fe50 | 137 | |
2425bcb9 | 138 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
139 | const char *name, int offset, int size, int is_signed, |
140 | int filter_type) | |
141 | { | |
142 | struct list_head *head; | |
143 | ||
144 | if (WARN_ON(!call->class)) | |
145 | return 0; | |
146 | ||
147 | head = trace_get_fields(call); | |
148 | return __trace_define_field(head, type, name, offset, size, | |
149 | is_signed, filter_type); | |
150 | } | |
17c873ec | 151 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 152 | |
9f616680 DW |
153 | #define __generic_field(type, item, filter_type) \ |
154 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
155 | #item, 0, 0, is_signed_type(type), \ | |
156 | filter_type); \ | |
157 | if (ret) \ | |
158 | return ret; | |
159 | ||
e647d6b3 | 160 | #define __common_field(type, item) \ |
8728fe50 LZ |
161 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
162 | "common_" #item, \ | |
163 | offsetof(typeof(ent), item), \ | |
164 | sizeof(ent.item), \ | |
165 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
166 | if (ret) \ |
167 | return ret; | |
168 | ||
9f616680 DW |
169 | static int trace_define_generic_fields(void) |
170 | { | |
171 | int ret; | |
172 | ||
e57cbaf0 SRRH |
173 | __generic_field(int, CPU, FILTER_CPU); |
174 | __generic_field(int, cpu, FILTER_CPU); | |
175 | __generic_field(char *, COMM, FILTER_COMM); | |
176 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
177 | |
178 | return ret; | |
179 | } | |
180 | ||
8728fe50 | 181 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
182 | { |
183 | int ret; | |
184 | struct trace_entry ent; | |
185 | ||
186 | __common_field(unsigned short, type); | |
187 | __common_field(unsigned char, flags); | |
188 | __common_field(unsigned char, preempt_count); | |
189 | __common_field(int, pid); | |
e647d6b3 LZ |
190 | |
191 | return ret; | |
192 | } | |
193 | ||
2425bcb9 | 194 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
195 | { |
196 | struct ftrace_event_field *field, *next; | |
2e33af02 | 197 | struct list_head *head; |
2df75e41 | 198 | |
2e33af02 SR |
199 | head = trace_get_fields(call); |
200 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 201 | list_del(&field->link); |
d1a29143 | 202 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
203 | } |
204 | } | |
205 | ||
32bbe007 AS |
206 | /* |
207 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
208 | * accessible offset of trace fields excluding __dynamic_array bytes | |
209 | */ | |
210 | int trace_event_get_offsets(struct trace_event_call *call) | |
211 | { | |
212 | struct ftrace_event_field *tail; | |
213 | struct list_head *head; | |
214 | ||
215 | head = trace_get_fields(call); | |
216 | /* | |
217 | * head->next points to the last field with the largest offset, | |
218 | * since it was added last by trace_define_field() | |
219 | */ | |
220 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
221 | return tail->offset + tail->size; | |
222 | } | |
223 | ||
2425bcb9 | 224 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
225 | { |
226 | int id; | |
227 | ||
9023c930 | 228 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
229 | if (!id) |
230 | return -ENODEV; | |
87d9b4e1 LZ |
231 | |
232 | return 0; | |
233 | } | |
234 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
235 | ||
3fdaf80f SRRH |
236 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
237 | { | |
238 | struct trace_array *tr = trace_file->tr; | |
239 | struct trace_array_cpu *data; | |
240 | struct trace_pid_list *pid_list; | |
241 | ||
242 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
243 | if (!pid_list) | |
244 | return false; | |
245 | ||
246 | data = this_cpu_ptr(tr->trace_buffer.data); | |
247 | ||
248 | return data->ignore_pid; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
251 | ||
3f795dcf SRRH |
252 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
253 | struct trace_event_file *trace_file, | |
254 | unsigned long len) | |
3fd40d1e | 255 | { |
2425bcb9 | 256 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 257 | |
3fdaf80f SRRH |
258 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
259 | trace_event_ignore_this_pid(trace_file)) | |
260 | return NULL; | |
261 | ||
3fd40d1e SR |
262 | local_save_flags(fbuffer->flags); |
263 | fbuffer->pc = preempt_count(); | |
e947841c SRRH |
264 | /* |
265 | * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables | |
266 | * preemption (adding one to the preempt_count). Since we are | |
267 | * interested in the preempt_count at the time the tracepoint was | |
268 | * hit, we need to subtract one to offset the increment. | |
269 | */ | |
270 | if (IS_ENABLED(CONFIG_PREEMPT)) | |
271 | fbuffer->pc--; | |
7f1d2f82 | 272 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
273 | |
274 | fbuffer->event = | |
7f1d2f82 | 275 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
276 | event_call->event.type, len, |
277 | fbuffer->flags, fbuffer->pc); | |
278 | if (!fbuffer->event) | |
279 | return NULL; | |
280 | ||
281 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
282 | return fbuffer->entry; | |
283 | } | |
3f795dcf | 284 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 285 | |
0daa2302 SRRH |
286 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
287 | ||
3f795dcf | 288 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 289 | { |
2425bcb9 | 290 | struct trace_event_call *event_call; |
0daa2302 SRRH |
291 | struct trace_event *event; |
292 | unsigned long flags; | |
293 | struct trace_iterator *iter = tracepoint_print_iter; | |
294 | ||
295 | if (!iter) | |
296 | return; | |
297 | ||
7f1d2f82 | 298 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
299 | if (!event_call || !event_call->event.funcs || |
300 | !event_call->event.funcs->trace) | |
301 | return; | |
302 | ||
7f1d2f82 | 303 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
304 | |
305 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
306 | trace_seq_init(&iter->seq); | |
307 | iter->ent = fbuffer->entry; | |
308 | event_call->event.funcs->trace(iter, 0, event); | |
309 | trace_seq_putc(&iter->seq, 0); | |
310 | printk("%s", iter->seq.buffer); | |
311 | ||
312 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
313 | } | |
314 | ||
3f795dcf | 315 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 316 | { |
0daa2302 SRRH |
317 | if (tracepoint_printk) |
318 | output_printk(fbuffer); | |
319 | ||
7f1d2f82 | 320 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
321 | fbuffer->event, fbuffer->entry, |
322 | fbuffer->flags, fbuffer->pc); | |
323 | } | |
3f795dcf | 324 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 325 | |
2425bcb9 | 326 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 327 | enum trace_reg type, void *data) |
a1d0ce82 | 328 | { |
7f1d2f82 | 329 | struct trace_event_file *file = data; |
b1dace68 | 330 | struct tracepoint *tp; |
ae63b31e | 331 | |
de7b2973 | 332 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
b1dace68 JD |
333 | |
334 | if (call->flags & TRACE_EVENT_FL_MAP) | |
335 | tp = call->map->tp; | |
336 | else | |
337 | tp = call->tp; | |
338 | ||
a1d0ce82 SR |
339 | switch (type) { |
340 | case TRACE_REG_REGISTER: | |
b1dace68 | 341 | return tracepoint_probe_register(tp, |
a1d0ce82 | 342 | call->class->probe, |
ae63b31e | 343 | file); |
a1d0ce82 | 344 | case TRACE_REG_UNREGISTER: |
b1dace68 | 345 | tracepoint_probe_unregister(tp, |
a1d0ce82 | 346 | call->class->probe, |
ae63b31e | 347 | file); |
a1d0ce82 SR |
348 | return 0; |
349 | ||
350 | #ifdef CONFIG_PERF_EVENTS | |
351 | case TRACE_REG_PERF_REGISTER: | |
b1dace68 | 352 | return tracepoint_probe_register(tp, |
a1d0ce82 SR |
353 | call->class->perf_probe, |
354 | call); | |
355 | case TRACE_REG_PERF_UNREGISTER: | |
b1dace68 | 356 | tracepoint_probe_unregister(tp, |
a1d0ce82 SR |
357 | call->class->perf_probe, |
358 | call); | |
359 | return 0; | |
ceec0b6f JO |
360 | case TRACE_REG_PERF_OPEN: |
361 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
362 | case TRACE_REG_PERF_ADD: |
363 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 364 | return 0; |
a1d0ce82 SR |
365 | #endif |
366 | } | |
367 | return 0; | |
368 | } | |
9023c930 | 369 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 370 | |
e870e9a1 LZ |
371 | void trace_event_enable_cmd_record(bool enable) |
372 | { | |
7f1d2f82 | 373 | struct trace_event_file *file; |
ae63b31e | 374 | struct trace_array *tr; |
e870e9a1 LZ |
375 | |
376 | mutex_lock(&event_mutex); | |
ae63b31e SR |
377 | do_for_each_event_file(tr, file) { |
378 | ||
5d6ad960 | 379 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
380 | continue; |
381 | ||
382 | if (enable) { | |
383 | tracing_start_cmdline_record(); | |
5d6ad960 | 384 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
385 | } else { |
386 | tracing_stop_cmdline_record(); | |
5d6ad960 | 387 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 388 | } |
ae63b31e | 389 | } while_for_each_event_file(); |
e870e9a1 LZ |
390 | mutex_unlock(&event_mutex); |
391 | } | |
392 | ||
7f1d2f82 | 393 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 394 | int enable, int soft_disable) |
fd994989 | 395 | { |
2425bcb9 | 396 | struct trace_event_call *call = file->event_call; |
983f938a | 397 | struct trace_array *tr = file->tr; |
0fc1b09f | 398 | unsigned long file_flags = file->flags; |
3b8e4273 | 399 | int ret = 0; |
417944c4 | 400 | int disable; |
3b8e4273 | 401 | |
fd994989 SR |
402 | switch (enable) { |
403 | case 0: | |
417944c4 | 404 | /* |
1cf4c073 MH |
405 | * When soft_disable is set and enable is cleared, the sm_ref |
406 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
407 | * to clear the SOFT_DISABLED flag but leave the event in the |
408 | * state that it was. That is, if the event was enabled and | |
409 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
410 | * is set we do not want the event to be enabled before we | |
411 | * clear the bit. | |
412 | * | |
413 | * When soft_disable is not set but the SOFT_MODE flag is, | |
414 | * we do nothing. Do not disable the tracepoint, otherwise | |
415 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
416 | */ | |
417 | if (soft_disable) { | |
1cf4c073 MH |
418 | if (atomic_dec_return(&file->sm_ref) > 0) |
419 | break; | |
5d6ad960 SRRH |
420 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
421 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 422 | } else |
5d6ad960 | 423 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 424 | |
5d6ad960 SRRH |
425 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
426 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
427 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 428 | tracing_stop_cmdline_record(); |
5d6ad960 | 429 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 430 | } |
ae63b31e | 431 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 432 | } |
3baa5e4c | 433 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
434 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
435 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 436 | else |
5d6ad960 | 437 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
438 | break; |
439 | case 1: | |
417944c4 SRRH |
440 | /* |
441 | * When soft_disable is set and enable is set, we want to | |
442 | * register the tracepoint for the event, but leave the event | |
443 | * as is. That means, if the event was already enabled, we do | |
444 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
445 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
446 | * it still seems to be disabled. | |
447 | */ | |
448 | if (!soft_disable) | |
5d6ad960 | 449 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
450 | else { |
451 | if (atomic_inc_return(&file->sm_ref) > 1) | |
452 | break; | |
5d6ad960 | 453 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 454 | } |
417944c4 | 455 | |
5d6ad960 | 456 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
457 | |
458 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
459 | if (soft_disable) | |
5d6ad960 | 460 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 461 | |
983f938a | 462 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
e870e9a1 | 463 | tracing_start_cmdline_record(); |
5d6ad960 | 464 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 465 | } |
ae63b31e | 466 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
467 | if (ret) { |
468 | tracing_stop_cmdline_record(); | |
469 | pr_info("event trace: Could not enable event " | |
687fcc4a | 470 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
471 | break; |
472 | } | |
5d6ad960 | 473 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
474 | |
475 | /* WAS_ENABLED gets set but never cleared. */ | |
476 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 477 | } |
fd994989 SR |
478 | break; |
479 | } | |
3b8e4273 | 480 | |
0fc1b09f SRRH |
481 | /* Enable or disable use of trace_buffered_event */ |
482 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
483 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
484 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
485 | trace_buffered_event_enable(); | |
486 | else | |
487 | trace_buffered_event_disable(); | |
488 | } | |
489 | ||
3b8e4273 | 490 | return ret; |
fd994989 SR |
491 | } |
492 | ||
7f1d2f82 | 493 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
494 | int enable, int soft_disable) |
495 | { | |
496 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
497 | } | |
498 | ||
7f1d2f82 | 499 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
500 | int enable) |
501 | { | |
502 | return __ftrace_event_enable_disable(file, enable, 0); | |
503 | } | |
504 | ||
ae63b31e | 505 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 506 | { |
7f1d2f82 | 507 | struct trace_event_file *file; |
0e907c99 Z |
508 | |
509 | mutex_lock(&event_mutex); | |
ae63b31e SR |
510 | list_for_each_entry(file, &tr->events, list) { |
511 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
512 | } |
513 | mutex_unlock(&event_mutex); | |
514 | } | |
515 | ||
c37775d5 SR |
516 | static void |
517 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
518 | { | |
519 | struct trace_pid_list *pid_list; | |
520 | struct trace_array *tr = data; | |
521 | ||
522 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 523 | trace_filter_add_remove_task(pid_list, NULL, task); |
c37775d5 SR |
524 | } |
525 | ||
526 | static void | |
527 | event_filter_pid_sched_process_fork(void *data, | |
528 | struct task_struct *self, | |
529 | struct task_struct *task) | |
530 | { | |
531 | struct trace_pid_list *pid_list; | |
532 | struct trace_array *tr = data; | |
533 | ||
534 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 535 | trace_filter_add_remove_task(pid_list, self, task); |
c37775d5 SR |
536 | } |
537 | ||
538 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
539 | { | |
540 | if (enable) { | |
541 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
542 | tr, INT_MIN); | |
543 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
544 | tr, INT_MAX); | |
545 | } else { | |
546 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
547 | tr); | |
548 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
549 | tr); | |
550 | } | |
3fdaf80f SRRH |
551 | } |
552 | ||
553 | static void | |
22402cd0 | 554 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
555 | struct task_struct *prev, struct task_struct *next) |
556 | { | |
557 | struct trace_array *tr = data; | |
558 | struct trace_pid_list *pid_list; | |
559 | ||
560 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
561 | ||
562 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 SR |
563 | trace_ignore_this_task(pid_list, prev) && |
564 | trace_ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
565 | } |
566 | ||
567 | static void | |
22402cd0 | 568 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
569 | struct task_struct *prev, struct task_struct *next) |
570 | { | |
571 | struct trace_array *tr = data; | |
572 | struct trace_pid_list *pid_list; | |
573 | ||
574 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
575 | ||
576 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 577 | trace_ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
578 | } |
579 | ||
580 | static void | |
581 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
582 | { | |
583 | struct trace_array *tr = data; | |
584 | struct trace_pid_list *pid_list; | |
585 | ||
586 | /* Nothing to do if we are already tracing */ | |
587 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
588 | return; | |
589 | ||
590 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
591 | ||
592 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 593 | trace_ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
594 | } |
595 | ||
596 | static void | |
597 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
598 | { | |
599 | struct trace_array *tr = data; | |
600 | struct trace_pid_list *pid_list; | |
601 | ||
602 | /* Nothing to do if we are not tracing */ | |
603 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
604 | return; | |
605 | ||
606 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
607 | ||
608 | /* Set tracing if current is enabled */ | |
609 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 610 | trace_ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
611 | } |
612 | ||
49090107 SRRH |
613 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
614 | { | |
615 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
616 | struct trace_event_file *file; |
617 | int cpu; | |
49090107 SRRH |
618 | |
619 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
620 | lockdep_is_held(&event_mutex)); | |
621 | if (!pid_list) | |
622 | return; | |
623 | ||
3fdaf80f SRRH |
624 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
625 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
626 | ||
627 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
628 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
629 | ||
0f72e37e SRRH |
630 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
631 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
632 | ||
633 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
634 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
635 | ||
3fdaf80f SRRH |
636 | list_for_each_entry(file, &tr->events, list) { |
637 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
638 | } | |
639 | ||
640 | for_each_possible_cpu(cpu) | |
641 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
642 | ||
49090107 SRRH |
643 | rcu_assign_pointer(tr->filtered_pids, NULL); |
644 | ||
645 | /* Wait till all users are no longer using pid filtering */ | |
646 | synchronize_sched(); | |
647 | ||
76c813e2 | 648 | trace_free_pid_list(pid_list); |
49090107 SRRH |
649 | } |
650 | ||
651 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
652 | { | |
653 | mutex_lock(&event_mutex); | |
654 | __ftrace_clear_event_pids(tr); | |
655 | mutex_unlock(&event_mutex); | |
656 | } | |
657 | ||
e9dbfae5 SR |
658 | static void __put_system(struct event_subsystem *system) |
659 | { | |
660 | struct event_filter *filter = system->filter; | |
661 | ||
6e94a780 SR |
662 | WARN_ON_ONCE(system_refcount(system) == 0); |
663 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
664 | return; |
665 | ||
ae63b31e SR |
666 | list_del(&system->list); |
667 | ||
e9dbfae5 SR |
668 | if (filter) { |
669 | kfree(filter->filter_string); | |
670 | kfree(filter); | |
671 | } | |
79ac6ef5 | 672 | kfree_const(system->name); |
e9dbfae5 SR |
673 | kfree(system); |
674 | } | |
675 | ||
676 | static void __get_system(struct event_subsystem *system) | |
677 | { | |
6e94a780 SR |
678 | WARN_ON_ONCE(system_refcount(system) == 0); |
679 | system_refcount_inc(system); | |
e9dbfae5 SR |
680 | } |
681 | ||
7967b3e0 | 682 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
683 | { |
684 | WARN_ON_ONCE(dir->ref_count == 0); | |
685 | dir->ref_count++; | |
686 | __get_system(dir->subsystem); | |
687 | } | |
688 | ||
7967b3e0 | 689 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
690 | { |
691 | WARN_ON_ONCE(dir->ref_count == 0); | |
692 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 693 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
694 | |
695 | __put_system(dir->subsystem); | |
696 | if (!--dir->ref_count) | |
697 | kfree(dir); | |
698 | } | |
699 | ||
7967b3e0 | 700 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
701 | { |
702 | mutex_lock(&event_mutex); | |
ae63b31e | 703 | __put_system_dir(dir); |
e9dbfae5 SR |
704 | mutex_unlock(&event_mutex); |
705 | } | |
706 | ||
7967b3e0 | 707 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
708 | { |
709 | if (!dir) | |
710 | return; | |
711 | ||
712 | if (!--dir->nr_events) { | |
8434dc93 | 713 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
714 | list_del(&dir->list); |
715 | __put_system_dir(dir); | |
716 | } | |
717 | } | |
718 | ||
7f1d2f82 | 719 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 720 | { |
bf682c31 ON |
721 | struct dentry *dir = file->dir; |
722 | struct dentry *child; | |
723 | ||
724 | if (dir) { | |
725 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 726 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
727 | if (d_really_is_positive(child)) /* probably unneeded */ |
728 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
729 | } |
730 | spin_unlock(&dir->d_lock); | |
731 | ||
8434dc93 | 732 | tracefs_remove_recursive(dir); |
bf682c31 ON |
733 | } |
734 | ||
f6a84bdc | 735 | list_del(&file->list); |
f6a84bdc | 736 | remove_subsystem(file->system); |
2448e349 | 737 | free_event_filter(file->filter); |
f6a84bdc ON |
738 | kmem_cache_free(file_cachep, file); |
739 | } | |
740 | ||
8f31bfe5 LZ |
741 | /* |
742 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
743 | */ | |
2a6c24af SRRH |
744 | static int |
745 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
746 | const char *sub, const char *event, int set) | |
b77e38aa | 747 | { |
7f1d2f82 | 748 | struct trace_event_file *file; |
2425bcb9 | 749 | struct trace_event_call *call; |
de7b2973 | 750 | const char *name; |
29f93943 | 751 | int ret = -EINVAL; |
8f31bfe5 | 752 | |
ae63b31e SR |
753 | list_for_each_entry(file, &tr->events, list) { |
754 | ||
755 | call = file->event_call; | |
687fcc4a | 756 | name = trace_event_name(call); |
8f31bfe5 | 757 | |
de7b2973 | 758 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
759 | continue; |
760 | ||
9b63776f SR |
761 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
762 | continue; | |
763 | ||
8f31bfe5 | 764 | if (match && |
de7b2973 | 765 | strcmp(match, name) != 0 && |
8f082018 | 766 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
767 | continue; |
768 | ||
8f082018 | 769 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
770 | continue; |
771 | ||
de7b2973 | 772 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
773 | continue; |
774 | ||
ae63b31e | 775 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
776 | |
777 | ret = 0; | |
778 | } | |
2a6c24af SRRH |
779 | |
780 | return ret; | |
781 | } | |
782 | ||
783 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
784 | const char *sub, const char *event, int set) | |
785 | { | |
786 | int ret; | |
787 | ||
788 | mutex_lock(&event_mutex); | |
789 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
790 | mutex_unlock(&event_mutex); |
791 | ||
792 | return ret; | |
793 | } | |
794 | ||
ae63b31e | 795 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 796 | { |
b628b3e6 | 797 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 798 | int ret; |
b628b3e6 SR |
799 | |
800 | /* | |
801 | * The buf format can be <subsystem>:<event-name> | |
802 | * *:<event-name> means any event by that name. | |
803 | * :<event-name> is the same. | |
804 | * | |
805 | * <subsystem>:* means all events in that subsystem | |
806 | * <subsystem>: means the same. | |
807 | * | |
808 | * <name> (no ':') means all events in a subsystem with | |
809 | * the name <name> or any event that matches <name> | |
810 | */ | |
811 | ||
812 | match = strsep(&buf, ":"); | |
813 | if (buf) { | |
814 | sub = match; | |
815 | event = buf; | |
816 | match = NULL; | |
817 | ||
818 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
819 | sub = NULL; | |
820 | if (!strlen(event) || strcmp(event, "*") == 0) | |
821 | event = NULL; | |
822 | } | |
b77e38aa | 823 | |
84fce9db JK |
824 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
825 | ||
826 | /* Put back the colon to allow this to be called again */ | |
827 | if (buf) | |
828 | *(buf - 1) = ':'; | |
829 | ||
830 | return ret; | |
b77e38aa SR |
831 | } |
832 | ||
4671c794 SR |
833 | /** |
834 | * trace_set_clr_event - enable or disable an event | |
835 | * @system: system name to match (NULL for any system) | |
836 | * @event: event name to match (NULL for all events, within system) | |
837 | * @set: 1 to enable, 0 to disable | |
838 | * | |
839 | * This is a way for other parts of the kernel to enable or disable | |
840 | * event recording. | |
841 | * | |
842 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
843 | * registered events. | |
844 | */ | |
845 | int trace_set_clr_event(const char *system, const char *event, int set) | |
846 | { | |
ae63b31e SR |
847 | struct trace_array *tr = top_trace_array(); |
848 | ||
dc81e5e3 YY |
849 | if (!tr) |
850 | return -ENODEV; | |
851 | ||
ae63b31e | 852 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 853 | } |
56355b83 | 854 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 855 | |
b77e38aa SR |
856 | /* 128 should be much more than enough */ |
857 | #define EVENT_BUF_SIZE 127 | |
858 | ||
859 | static ssize_t | |
860 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
861 | size_t cnt, loff_t *ppos) | |
862 | { | |
48966364 | 863 | struct trace_parser parser; |
ae63b31e SR |
864 | struct seq_file *m = file->private_data; |
865 | struct trace_array *tr = m->private; | |
4ba7978e | 866 | ssize_t read, ret; |
b77e38aa | 867 | |
4ba7978e | 868 | if (!cnt) |
b77e38aa SR |
869 | return 0; |
870 | ||
1852fcce SR |
871 | ret = tracing_update_buffers(); |
872 | if (ret < 0) | |
873 | return ret; | |
874 | ||
48966364 | 875 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
876 | return -ENOMEM; |
877 | ||
48966364 | 878 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
879 | ||
4ba7978e | 880 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 881 | int set = 1; |
b77e38aa | 882 | |
48966364 | 883 | if (*parser.buffer == '!') |
b77e38aa | 884 | set = 0; |
b77e38aa | 885 | |
48966364 | 886 | parser.buffer[parser.idx] = 0; |
887 | ||
ae63b31e | 888 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 889 | if (ret) |
48966364 | 890 | goto out_put; |
b77e38aa | 891 | } |
b77e38aa SR |
892 | |
893 | ret = read; | |
894 | ||
48966364 | 895 | out_put: |
896 | trace_parser_put(&parser); | |
b77e38aa SR |
897 | |
898 | return ret; | |
899 | } | |
900 | ||
901 | static void * | |
902 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
903 | { | |
7f1d2f82 | 904 | struct trace_event_file *file = v; |
2425bcb9 | 905 | struct trace_event_call *call; |
ae63b31e | 906 | struct trace_array *tr = m->private; |
b77e38aa SR |
907 | |
908 | (*pos)++; | |
909 | ||
ae63b31e SR |
910 | list_for_each_entry_continue(file, &tr->events, list) { |
911 | call = file->event_call; | |
40e26815 SR |
912 | /* |
913 | * The ftrace subsystem is for showing formats only. | |
914 | * They can not be enabled or disabled via the event files. | |
915 | */ | |
d045437a SRRH |
916 | if (call->class && call->class->reg && |
917 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 918 | return file; |
40e26815 | 919 | } |
b77e38aa | 920 | |
30bd39cd | 921 | return NULL; |
b77e38aa SR |
922 | } |
923 | ||
924 | static void *t_start(struct seq_file *m, loff_t *pos) | |
925 | { | |
7f1d2f82 | 926 | struct trace_event_file *file; |
ae63b31e | 927 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
928 | loff_t l; |
929 | ||
20c8928a | 930 | mutex_lock(&event_mutex); |
e1c7e2a6 | 931 | |
7f1d2f82 | 932 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 933 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
934 | file = t_next(m, file, &l); |
935 | if (!file) | |
e1c7e2a6 LZ |
936 | break; |
937 | } | |
ae63b31e | 938 | return file; |
b77e38aa SR |
939 | } |
940 | ||
941 | static void * | |
942 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
943 | { | |
7f1d2f82 | 944 | struct trace_event_file *file = v; |
ae63b31e | 945 | struct trace_array *tr = m->private; |
b77e38aa SR |
946 | |
947 | (*pos)++; | |
948 | ||
ae63b31e | 949 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 950 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 951 | return file; |
b77e38aa SR |
952 | } |
953 | ||
30bd39cd | 954 | return NULL; |
b77e38aa SR |
955 | } |
956 | ||
957 | static void *s_start(struct seq_file *m, loff_t *pos) | |
958 | { | |
7f1d2f82 | 959 | struct trace_event_file *file; |
ae63b31e | 960 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
961 | loff_t l; |
962 | ||
20c8928a | 963 | mutex_lock(&event_mutex); |
e1c7e2a6 | 964 | |
7f1d2f82 | 965 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 966 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
967 | file = s_next(m, file, &l); |
968 | if (!file) | |
e1c7e2a6 LZ |
969 | break; |
970 | } | |
ae63b31e | 971 | return file; |
b77e38aa SR |
972 | } |
973 | ||
974 | static int t_show(struct seq_file *m, void *v) | |
975 | { | |
7f1d2f82 | 976 | struct trace_event_file *file = v; |
2425bcb9 | 977 | struct trace_event_call *call = file->event_call; |
b77e38aa | 978 | |
8f082018 SR |
979 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
980 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 981 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
982 | |
983 | return 0; | |
984 | } | |
985 | ||
986 | static void t_stop(struct seq_file *m, void *p) | |
987 | { | |
20c8928a | 988 | mutex_unlock(&event_mutex); |
b77e38aa SR |
989 | } |
990 | ||
f4d34a87 SR |
991 | static void * |
992 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
993 | { | |
994 | struct trace_array *tr = m->private; | |
995 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
f4d34a87 | 996 | |
5cc8976b | 997 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
998 | } |
999 | ||
49090107 | 1000 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 1001 | __acquires(RCU) |
49090107 SRRH |
1002 | { |
1003 | struct trace_pid_list *pid_list; | |
1004 | struct trace_array *tr = m->private; | |
1005 | ||
1006 | /* | |
1007 | * Grab the mutex, to keep calls to p_next() having the same | |
1008 | * tr->filtered_pids as p_start() has. | |
1009 | * If we just passed the tr->filtered_pids around, then RCU would | |
1010 | * have been enough, but doing that makes things more complex. | |
1011 | */ | |
1012 | mutex_lock(&event_mutex); | |
1013 | rcu_read_lock_sched(); | |
1014 | ||
1015 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1016 | ||
f4d34a87 | 1017 | if (!pid_list) |
49090107 SRRH |
1018 | return NULL; |
1019 | ||
5cc8976b | 1020 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1021 | } |
1022 | ||
1023 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1024 | __releases(RCU) |
49090107 SRRH |
1025 | { |
1026 | rcu_read_unlock_sched(); | |
1027 | mutex_unlock(&event_mutex); | |
1028 | } | |
1029 | ||
1473e441 SR |
1030 | static ssize_t |
1031 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1032 | loff_t *ppos) | |
1033 | { | |
7f1d2f82 | 1034 | struct trace_event_file *file; |
bc6f6b08 | 1035 | unsigned long flags; |
a4390596 TZ |
1036 | char buf[4] = "0"; |
1037 | ||
bc6f6b08 ON |
1038 | mutex_lock(&event_mutex); |
1039 | file = event_file_data(filp); | |
1040 | if (likely(file)) | |
1041 | flags = file->flags; | |
1042 | mutex_unlock(&event_mutex); | |
1043 | ||
1044 | if (!file) | |
1045 | return -ENODEV; | |
1046 | ||
5d6ad960 SRRH |
1047 | if (flags & EVENT_FILE_FL_ENABLED && |
1048 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1049 | strcpy(buf, "1"); |
1050 | ||
5d6ad960 SRRH |
1051 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1052 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1053 | strcat(buf, "*"); |
1054 | ||
1055 | strcat(buf, "\n"); | |
1473e441 | 1056 | |
417944c4 | 1057 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1058 | } |
1059 | ||
1060 | static ssize_t | |
1061 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1062 | loff_t *ppos) | |
1063 | { | |
7f1d2f82 | 1064 | struct trace_event_file *file; |
1473e441 SR |
1065 | unsigned long val; |
1066 | int ret; | |
1067 | ||
22fe9b54 PH |
1068 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1069 | if (ret) | |
1473e441 SR |
1070 | return ret; |
1071 | ||
1852fcce SR |
1072 | ret = tracing_update_buffers(); |
1073 | if (ret < 0) | |
1074 | return ret; | |
1075 | ||
1473e441 SR |
1076 | switch (val) { |
1077 | case 0: | |
1473e441 | 1078 | case 1: |
bc6f6b08 | 1079 | ret = -ENODEV; |
11a241a3 | 1080 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1081 | file = event_file_data(filp); |
1082 | if (likely(file)) | |
1083 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1084 | mutex_unlock(&event_mutex); |
1473e441 SR |
1085 | break; |
1086 | ||
1087 | default: | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | ||
1091 | *ppos += cnt; | |
1092 | ||
3b8e4273 | 1093 | return ret ? ret : cnt; |
1473e441 SR |
1094 | } |
1095 | ||
8ae79a13 SR |
1096 | static ssize_t |
1097 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1098 | loff_t *ppos) | |
1099 | { | |
c142b15d | 1100 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1101 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1102 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1103 | struct trace_event_call *call; |
7f1d2f82 | 1104 | struct trace_event_file *file; |
ae63b31e | 1105 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1106 | char buf[2]; |
c142b15d | 1107 | int set = 0; |
8ae79a13 SR |
1108 | int ret; |
1109 | ||
8ae79a13 | 1110 | mutex_lock(&event_mutex); |
ae63b31e SR |
1111 | list_for_each_entry(file, &tr->events, list) { |
1112 | call = file->event_call; | |
687fcc4a | 1113 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1114 | continue; |
1115 | ||
40ee4dff | 1116 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1117 | continue; |
1118 | ||
1119 | /* | |
1120 | * We need to find out if all the events are set | |
1121 | * or if all events or cleared, or if we have | |
1122 | * a mixture. | |
1123 | */ | |
5d6ad960 | 1124 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1125 | |
8ae79a13 SR |
1126 | /* |
1127 | * If we have a mixture, no need to look further. | |
1128 | */ | |
c142b15d | 1129 | if (set == 3) |
8ae79a13 SR |
1130 | break; |
1131 | } | |
1132 | mutex_unlock(&event_mutex); | |
1133 | ||
c142b15d | 1134 | buf[0] = set_to_char[set]; |
8ae79a13 | 1135 | buf[1] = '\n'; |
8ae79a13 SR |
1136 | |
1137 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1138 | ||
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | static ssize_t | |
1143 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1144 | loff_t *ppos) | |
1145 | { | |
7967b3e0 | 1146 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1147 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1148 | const char *name = NULL; |
8ae79a13 | 1149 | unsigned long val; |
8ae79a13 SR |
1150 | ssize_t ret; |
1151 | ||
22fe9b54 PH |
1152 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1153 | if (ret) | |
8ae79a13 SR |
1154 | return ret; |
1155 | ||
1156 | ret = tracing_update_buffers(); | |
1157 | if (ret < 0) | |
1158 | return ret; | |
1159 | ||
8f31bfe5 | 1160 | if (val != 0 && val != 1) |
8ae79a13 | 1161 | return -EINVAL; |
8ae79a13 | 1162 | |
40ee4dff SR |
1163 | /* |
1164 | * Opening of "enable" adds a ref count to system, | |
1165 | * so the name is safe to use. | |
1166 | */ | |
1167 | if (system) | |
1168 | name = system->name; | |
1169 | ||
ae63b31e | 1170 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1171 | if (ret) |
8f31bfe5 | 1172 | goto out; |
8ae79a13 SR |
1173 | |
1174 | ret = cnt; | |
1175 | ||
8f31bfe5 | 1176 | out: |
8ae79a13 SR |
1177 | *ppos += cnt; |
1178 | ||
1179 | return ret; | |
1180 | } | |
1181 | ||
2a37a3df SR |
1182 | enum { |
1183 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1184 | FORMAT_FIELD_SEPERATOR = 2, |
1185 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1186 | }; |
1187 | ||
1188 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1189 | { |
2425bcb9 | 1190 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1191 | struct list_head *common_head = &ftrace_common_fields; |
1192 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1193 | struct list_head *node = v; |
981d081e | 1194 | |
2a37a3df | 1195 | (*pos)++; |
5a65e956 | 1196 | |
2a37a3df SR |
1197 | switch ((unsigned long)v) { |
1198 | case FORMAT_HEADER: | |
7710b639 ON |
1199 | node = common_head; |
1200 | break; | |
5a65e956 | 1201 | |
86397dc3 | 1202 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1203 | node = head; |
1204 | break; | |
5a65e956 | 1205 | |
2a37a3df SR |
1206 | case FORMAT_PRINTFMT: |
1207 | /* all done */ | |
1208 | return NULL; | |
5a65e956 LJ |
1209 | } |
1210 | ||
7710b639 ON |
1211 | node = node->prev; |
1212 | if (node == common_head) | |
86397dc3 | 1213 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1214 | else if (node == head) |
2a37a3df | 1215 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1216 | else |
1217 | return node; | |
2a37a3df SR |
1218 | } |
1219 | ||
1220 | static int f_show(struct seq_file *m, void *v) | |
1221 | { | |
2425bcb9 | 1222 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1223 | struct ftrace_event_field *field; |
1224 | const char *array_descriptor; | |
1225 | ||
1226 | switch ((unsigned long)v) { | |
1227 | case FORMAT_HEADER: | |
687fcc4a | 1228 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1229 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1230 | seq_puts(m, "format:\n"); |
8728fe50 | 1231 | return 0; |
5a65e956 | 1232 | |
86397dc3 LZ |
1233 | case FORMAT_FIELD_SEPERATOR: |
1234 | seq_putc(m, '\n'); | |
1235 | return 0; | |
1236 | ||
2a37a3df SR |
1237 | case FORMAT_PRINTFMT: |
1238 | seq_printf(m, "\nprint fmt: %s\n", | |
1239 | call->print_fmt); | |
1240 | return 0; | |
981d081e | 1241 | } |
8728fe50 | 1242 | |
7710b639 | 1243 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1244 | /* |
1245 | * Smartly shows the array type(except dynamic array). | |
1246 | * Normal: | |
1247 | * field:TYPE VAR | |
1248 | * If TYPE := TYPE[LEN], it is shown: | |
1249 | * field:TYPE VAR[LEN] | |
1250 | */ | |
1251 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1252 | |
2a37a3df SR |
1253 | if (!strncmp(field->type, "__data_loc", 10)) |
1254 | array_descriptor = NULL; | |
8728fe50 | 1255 | |
2a37a3df SR |
1256 | if (!array_descriptor) |
1257 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1258 | field->type, field->name, field->offset, | |
1259 | field->size, !!field->is_signed); | |
1260 | else | |
1261 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1262 | (int)(array_descriptor - field->type), | |
1263 | field->type, field->name, | |
1264 | array_descriptor, field->offset, | |
1265 | field->size, !!field->is_signed); | |
8728fe50 | 1266 | |
2a37a3df SR |
1267 | return 0; |
1268 | } | |
5a65e956 | 1269 | |
7710b639 ON |
1270 | static void *f_start(struct seq_file *m, loff_t *pos) |
1271 | { | |
1272 | void *p = (void *)FORMAT_HEADER; | |
1273 | loff_t l = 0; | |
1274 | ||
c5a44a12 ON |
1275 | /* ->stop() is called even if ->start() fails */ |
1276 | mutex_lock(&event_mutex); | |
1277 | if (!event_file_data(m->private)) | |
1278 | return ERR_PTR(-ENODEV); | |
1279 | ||
7710b639 ON |
1280 | while (l < *pos && p) |
1281 | p = f_next(m, p, &l); | |
1282 | ||
1283 | return p; | |
1284 | } | |
1285 | ||
2a37a3df SR |
1286 | static void f_stop(struct seq_file *m, void *p) |
1287 | { | |
c5a44a12 | 1288 | mutex_unlock(&event_mutex); |
2a37a3df | 1289 | } |
981d081e | 1290 | |
2a37a3df SR |
1291 | static const struct seq_operations trace_format_seq_ops = { |
1292 | .start = f_start, | |
1293 | .next = f_next, | |
1294 | .stop = f_stop, | |
1295 | .show = f_show, | |
1296 | }; | |
1297 | ||
1298 | static int trace_format_open(struct inode *inode, struct file *file) | |
1299 | { | |
2a37a3df SR |
1300 | struct seq_file *m; |
1301 | int ret; | |
1302 | ||
1303 | ret = seq_open(file, &trace_format_seq_ops); | |
1304 | if (ret < 0) | |
1305 | return ret; | |
1306 | ||
1307 | m = file->private_data; | |
c5a44a12 | 1308 | m->private = file; |
2a37a3df SR |
1309 | |
1310 | return 0; | |
981d081e SR |
1311 | } |
1312 | ||
23725aee PZ |
1313 | static ssize_t |
1314 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1315 | { | |
1a11126b | 1316 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1317 | char buf[32]; |
1318 | int len; | |
23725aee PZ |
1319 | |
1320 | if (*ppos) | |
1321 | return 0; | |
1322 | ||
1a11126b ON |
1323 | if (unlikely(!id)) |
1324 | return -ENODEV; | |
1325 | ||
1326 | len = sprintf(buf, "%d\n", id); | |
1327 | ||
cd458ba9 | 1328 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1329 | } |
1330 | ||
7ce7e424 TZ |
1331 | static ssize_t |
1332 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1333 | loff_t *ppos) | |
1334 | { | |
7f1d2f82 | 1335 | struct trace_event_file *file; |
7ce7e424 | 1336 | struct trace_seq *s; |
e2912b09 | 1337 | int r = -ENODEV; |
7ce7e424 TZ |
1338 | |
1339 | if (*ppos) | |
1340 | return 0; | |
1341 | ||
1342 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1343 | |
7ce7e424 TZ |
1344 | if (!s) |
1345 | return -ENOMEM; | |
1346 | ||
1347 | trace_seq_init(s); | |
1348 | ||
e2912b09 | 1349 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1350 | file = event_file_data(filp); |
1351 | if (file) | |
1352 | print_event_filter(file, s); | |
e2912b09 ON |
1353 | mutex_unlock(&event_mutex); |
1354 | ||
f306cc82 | 1355 | if (file) |
5ac48378 SRRH |
1356 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1357 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1358 | |
1359 | kfree(s); | |
1360 | ||
1361 | return r; | |
1362 | } | |
1363 | ||
1364 | static ssize_t | |
1365 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1366 | loff_t *ppos) | |
1367 | { | |
7f1d2f82 | 1368 | struct trace_event_file *file; |
8b372562 | 1369 | char *buf; |
e2912b09 | 1370 | int err = -ENODEV; |
7ce7e424 | 1371 | |
8b372562 | 1372 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1373 | return -EINVAL; |
1374 | ||
70f6cbb6 AV |
1375 | buf = memdup_user_nul(ubuf, cnt); |
1376 | if (IS_ERR(buf)) | |
1377 | return PTR_ERR(buf); | |
7ce7e424 | 1378 | |
e2912b09 | 1379 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1380 | file = event_file_data(filp); |
1381 | if (file) | |
1382 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1383 | mutex_unlock(&event_mutex); |
1384 | ||
70f6cbb6 | 1385 | kfree(buf); |
8b372562 | 1386 | if (err < 0) |
44e9c8b7 | 1387 | return err; |
0a19e53c | 1388 | |
7ce7e424 TZ |
1389 | *ppos += cnt; |
1390 | ||
1391 | return cnt; | |
1392 | } | |
1393 | ||
e9dbfae5 SR |
1394 | static LIST_HEAD(event_subsystems); |
1395 | ||
1396 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1397 | { | |
1398 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1399 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1400 | struct trace_array *tr; |
e9dbfae5 SR |
1401 | int ret; |
1402 | ||
d6d3523c GB |
1403 | if (tracing_is_disabled()) |
1404 | return -ENODEV; | |
1405 | ||
e9dbfae5 | 1406 | /* Make sure the system still exists */ |
a8227415 | 1407 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1408 | mutex_lock(&event_mutex); |
ae63b31e SR |
1409 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1410 | list_for_each_entry(dir, &tr->systems, list) { | |
1411 | if (dir == inode->i_private) { | |
1412 | /* Don't open systems with no events */ | |
1413 | if (dir->nr_events) { | |
1414 | __get_system_dir(dir); | |
1415 | system = dir->subsystem; | |
1416 | } | |
1417 | goto exit_loop; | |
e9dbfae5 | 1418 | } |
e9dbfae5 SR |
1419 | } |
1420 | } | |
ae63b31e | 1421 | exit_loop: |
e9dbfae5 | 1422 | mutex_unlock(&event_mutex); |
a8227415 | 1423 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1424 | |
ae63b31e | 1425 | if (!system) |
e9dbfae5 SR |
1426 | return -ENODEV; |
1427 | ||
ae63b31e SR |
1428 | /* Some versions of gcc think dir can be uninitialized here */ |
1429 | WARN_ON(!dir); | |
1430 | ||
8e2e2fa4 SRRH |
1431 | /* Still need to increment the ref count of the system */ |
1432 | if (trace_array_get(tr) < 0) { | |
1433 | put_system(dir); | |
1434 | return -ENODEV; | |
1435 | } | |
1436 | ||
e9dbfae5 | 1437 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1438 | if (ret < 0) { |
1439 | trace_array_put(tr); | |
ae63b31e | 1440 | put_system(dir); |
8e2e2fa4 | 1441 | } |
ae63b31e SR |
1442 | |
1443 | return ret; | |
1444 | } | |
1445 | ||
1446 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1447 | { | |
7967b3e0 | 1448 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1449 | struct trace_array *tr = inode->i_private; |
1450 | int ret; | |
1451 | ||
d6d3523c GB |
1452 | if (tracing_is_disabled()) |
1453 | return -ENODEV; | |
1454 | ||
8e2e2fa4 SRRH |
1455 | if (trace_array_get(tr) < 0) |
1456 | return -ENODEV; | |
1457 | ||
ae63b31e SR |
1458 | /* Make a temporary dir that has no system but points to tr */ |
1459 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1460 | if (!dir) { |
1461 | trace_array_put(tr); | |
ae63b31e | 1462 | return -ENOMEM; |
8e2e2fa4 | 1463 | } |
ae63b31e SR |
1464 | |
1465 | dir->tr = tr; | |
1466 | ||
1467 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1468 | if (ret < 0) { |
1469 | trace_array_put(tr); | |
ae63b31e | 1470 | kfree(dir); |
d6d3523c | 1471 | return ret; |
8e2e2fa4 | 1472 | } |
ae63b31e SR |
1473 | |
1474 | filp->private_data = dir; | |
e9dbfae5 | 1475 | |
d6d3523c | 1476 | return 0; |
e9dbfae5 SR |
1477 | } |
1478 | ||
1479 | static int subsystem_release(struct inode *inode, struct file *file) | |
1480 | { | |
7967b3e0 | 1481 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1482 | |
8e2e2fa4 SRRH |
1483 | trace_array_put(dir->tr); |
1484 | ||
ae63b31e SR |
1485 | /* |
1486 | * If dir->subsystem is NULL, then this is a temporary | |
1487 | * descriptor that was made for a trace_array to enable | |
1488 | * all subsystems. | |
1489 | */ | |
1490 | if (dir->subsystem) | |
1491 | put_system(dir); | |
1492 | else | |
1493 | kfree(dir); | |
e9dbfae5 SR |
1494 | |
1495 | return 0; | |
1496 | } | |
1497 | ||
cfb180f3 TZ |
1498 | static ssize_t |
1499 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1500 | loff_t *ppos) | |
1501 | { | |
7967b3e0 | 1502 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1503 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1504 | struct trace_seq *s; |
1505 | int r; | |
1506 | ||
1507 | if (*ppos) | |
1508 | return 0; | |
1509 | ||
1510 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1511 | if (!s) | |
1512 | return -ENOMEM; | |
1513 | ||
1514 | trace_seq_init(s); | |
1515 | ||
8b372562 | 1516 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1517 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1518 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1519 | |
1520 | kfree(s); | |
1521 | ||
1522 | return r; | |
1523 | } | |
1524 | ||
1525 | static ssize_t | |
1526 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1527 | loff_t *ppos) | |
1528 | { | |
7967b3e0 | 1529 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1530 | char *buf; |
cfb180f3 TZ |
1531 | int err; |
1532 | ||
8b372562 | 1533 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1534 | return -EINVAL; |
1535 | ||
70f6cbb6 AV |
1536 | buf = memdup_user_nul(ubuf, cnt); |
1537 | if (IS_ERR(buf)) | |
1538 | return PTR_ERR(buf); | |
cfb180f3 | 1539 | |
ae63b31e | 1540 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1541 | kfree(buf); |
8b372562 | 1542 | if (err < 0) |
44e9c8b7 | 1543 | return err; |
cfb180f3 TZ |
1544 | |
1545 | *ppos += cnt; | |
1546 | ||
1547 | return cnt; | |
1548 | } | |
1549 | ||
d1b182a8 SR |
1550 | static ssize_t |
1551 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1552 | { | |
1553 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1554 | struct trace_seq *s; | |
1555 | int r; | |
1556 | ||
1557 | if (*ppos) | |
1558 | return 0; | |
1559 | ||
1560 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1561 | if (!s) | |
1562 | return -ENOMEM; | |
1563 | ||
1564 | trace_seq_init(s); | |
1565 | ||
1566 | func(s); | |
5ac48378 SRRH |
1567 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1568 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1569 | |
1570 | kfree(s); | |
1571 | ||
1572 | return r; | |
1573 | } | |
1574 | ||
8ca532ad SRRH |
1575 | static void ignore_task_cpu(void *data) |
1576 | { | |
1577 | struct trace_array *tr = data; | |
1578 | struct trace_pid_list *pid_list; | |
1579 | ||
1580 | /* | |
1581 | * This function is called by on_each_cpu() while the | |
1582 | * event_mutex is held. | |
1583 | */ | |
1584 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1585 | mutex_is_locked(&event_mutex)); | |
1586 | ||
1587 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 1588 | trace_ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1589 | } |
1590 | ||
49090107 | 1591 | static ssize_t |
3fdaf80f | 1592 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1593 | size_t cnt, loff_t *ppos) |
1594 | { | |
3fdaf80f | 1595 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1596 | struct trace_array *tr = m->private; |
1597 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1598 | struct trace_pid_list *pid_list; |
3fdaf80f | 1599 | struct trace_event_file *file; |
76c813e2 | 1600 | ssize_t ret; |
49090107 SRRH |
1601 | |
1602 | if (!cnt) | |
1603 | return 0; | |
1604 | ||
1605 | ret = tracing_update_buffers(); | |
1606 | if (ret < 0) | |
1607 | return ret; | |
1608 | ||
49090107 | 1609 | mutex_lock(&event_mutex); |
76c813e2 | 1610 | |
f4d34a87 SR |
1611 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1612 | lockdep_is_held(&event_mutex)); | |
1613 | ||
76c813e2 SRRH |
1614 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1615 | if (ret < 0) | |
f4d34a87 | 1616 | goto out; |
49090107 | 1617 | |
49090107 SRRH |
1618 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1619 | ||
3fdaf80f SRRH |
1620 | list_for_each_entry(file, &tr->events, list) { |
1621 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1622 | } | |
49090107 SRRH |
1623 | |
1624 | if (filtered_pids) { | |
1625 | synchronize_sched(); | |
76c813e2 SRRH |
1626 | trace_free_pid_list(filtered_pids); |
1627 | } else if (pid_list) { | |
3fdaf80f SRRH |
1628 | /* |
1629 | * Register a probe that is called before all other probes | |
1630 | * to set ignore_pid if next or prev do not match. | |
1631 | * Register a probe this is called after all other probes | |
1632 | * to only keep ignore_pid set if next pid matches. | |
1633 | */ | |
1634 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1635 | tr, INT_MAX); | |
1636 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1637 | tr, 0); | |
1638 | ||
1639 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1640 | tr, INT_MAX); | |
1641 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1642 | tr, 0); | |
0f72e37e SRRH |
1643 | |
1644 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1645 | tr, INT_MAX); | |
1646 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1647 | tr, 0); | |
1648 | ||
1649 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1650 | tr, INT_MAX); | |
1651 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1652 | tr, 0); | |
49090107 SRRH |
1653 | } |
1654 | ||
799fd44c SRRH |
1655 | /* |
1656 | * Ignoring of pids is done at task switch. But we have to | |
1657 | * check for those tasks that are currently running. | |
1658 | * Always do this in case a pid was appended or removed. | |
1659 | */ | |
1660 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1661 | ||
f4d34a87 | 1662 | out: |
3fdaf80f SRRH |
1663 | mutex_unlock(&event_mutex); |
1664 | ||
76c813e2 SRRH |
1665 | if (ret > 0) |
1666 | *ppos += ret; | |
49090107 SRRH |
1667 | |
1668 | return ret; | |
1669 | } | |
1670 | ||
15075cac SR |
1671 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1672 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1673 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1674 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1675 | |
b77e38aa SR |
1676 | static const struct seq_operations show_event_seq_ops = { |
1677 | .start = t_start, | |
1678 | .next = t_next, | |
1679 | .show = t_show, | |
1680 | .stop = t_stop, | |
1681 | }; | |
1682 | ||
1683 | static const struct seq_operations show_set_event_seq_ops = { | |
1684 | .start = s_start, | |
1685 | .next = s_next, | |
1686 | .show = t_show, | |
1687 | .stop = t_stop, | |
1688 | }; | |
1689 | ||
49090107 SRRH |
1690 | static const struct seq_operations show_set_pid_seq_ops = { |
1691 | .start = p_start, | |
1692 | .next = p_next, | |
5cc8976b | 1693 | .show = trace_pid_show, |
49090107 SRRH |
1694 | .stop = p_stop, |
1695 | }; | |
1696 | ||
2314c4ae | 1697 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1698 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1699 | .read = seq_read, |
1700 | .llseek = seq_lseek, | |
1701 | .release = seq_release, | |
1702 | }; | |
1703 | ||
b77e38aa | 1704 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1705 | .open = ftrace_event_set_open, |
b77e38aa SR |
1706 | .read = seq_read, |
1707 | .write = ftrace_event_write, | |
1708 | .llseek = seq_lseek, | |
f77d09a3 | 1709 | .release = ftrace_event_release, |
b77e38aa SR |
1710 | }; |
1711 | ||
49090107 SRRH |
1712 | static const struct file_operations ftrace_set_event_pid_fops = { |
1713 | .open = ftrace_event_set_pid_open, | |
1714 | .read = seq_read, | |
1715 | .write = ftrace_event_pid_write, | |
1716 | .llseek = seq_lseek, | |
1717 | .release = ftrace_event_release, | |
1718 | }; | |
1719 | ||
1473e441 | 1720 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1721 | .open = tracing_open_generic, |
1473e441 SR |
1722 | .read = event_enable_read, |
1723 | .write = event_enable_write, | |
6038f373 | 1724 | .llseek = default_llseek, |
1473e441 SR |
1725 | }; |
1726 | ||
981d081e | 1727 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1728 | .open = trace_format_open, |
1729 | .read = seq_read, | |
1730 | .llseek = seq_lseek, | |
1731 | .release = seq_release, | |
981d081e SR |
1732 | }; |
1733 | ||
23725aee | 1734 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1735 | .read = event_id_read, |
6038f373 | 1736 | .llseek = default_llseek, |
23725aee PZ |
1737 | }; |
1738 | ||
7ce7e424 TZ |
1739 | static const struct file_operations ftrace_event_filter_fops = { |
1740 | .open = tracing_open_generic, | |
1741 | .read = event_filter_read, | |
1742 | .write = event_filter_write, | |
6038f373 | 1743 | .llseek = default_llseek, |
7ce7e424 TZ |
1744 | }; |
1745 | ||
cfb180f3 | 1746 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1747 | .open = subsystem_open, |
cfb180f3 TZ |
1748 | .read = subsystem_filter_read, |
1749 | .write = subsystem_filter_write, | |
6038f373 | 1750 | .llseek = default_llseek, |
e9dbfae5 | 1751 | .release = subsystem_release, |
cfb180f3 TZ |
1752 | }; |
1753 | ||
8ae79a13 | 1754 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1755 | .open = subsystem_open, |
8ae79a13 SR |
1756 | .read = system_enable_read, |
1757 | .write = system_enable_write, | |
6038f373 | 1758 | .llseek = default_llseek, |
40ee4dff | 1759 | .release = subsystem_release, |
8ae79a13 SR |
1760 | }; |
1761 | ||
ae63b31e SR |
1762 | static const struct file_operations ftrace_tr_enable_fops = { |
1763 | .open = system_tr_open, | |
1764 | .read = system_enable_read, | |
1765 | .write = system_enable_write, | |
1766 | .llseek = default_llseek, | |
1767 | .release = subsystem_release, | |
1768 | }; | |
1769 | ||
d1b182a8 SR |
1770 | static const struct file_operations ftrace_show_header_fops = { |
1771 | .open = tracing_open_generic, | |
1772 | .read = show_header, | |
6038f373 | 1773 | .llseek = default_llseek, |
d1b182a8 SR |
1774 | }; |
1775 | ||
ae63b31e SR |
1776 | static int |
1777 | ftrace_event_open(struct inode *inode, struct file *file, | |
1778 | const struct seq_operations *seq_ops) | |
1473e441 | 1779 | { |
ae63b31e SR |
1780 | struct seq_file *m; |
1781 | int ret; | |
1473e441 | 1782 | |
ae63b31e SR |
1783 | ret = seq_open(file, seq_ops); |
1784 | if (ret < 0) | |
1785 | return ret; | |
1786 | m = file->private_data; | |
1787 | /* copy tr over to seq ops */ | |
1788 | m->private = inode->i_private; | |
1473e441 | 1789 | |
ae63b31e | 1790 | return ret; |
1473e441 SR |
1791 | } |
1792 | ||
f77d09a3 AL |
1793 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1794 | { | |
1795 | struct trace_array *tr = inode->i_private; | |
1796 | ||
1797 | trace_array_put(tr); | |
1798 | ||
1799 | return seq_release(inode, file); | |
1800 | } | |
1801 | ||
15075cac SR |
1802 | static int |
1803 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1804 | { | |
1805 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1806 | ||
ae63b31e | 1807 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1808 | } |
1809 | ||
1810 | static int | |
1811 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1812 | { | |
1813 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1814 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1815 | int ret; |
1816 | ||
1817 | if (trace_array_get(tr) < 0) | |
1818 | return -ENODEV; | |
15075cac SR |
1819 | |
1820 | if ((file->f_mode & FMODE_WRITE) && | |
1821 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1822 | ftrace_clear_events(tr); |
15075cac | 1823 | |
f77d09a3 AL |
1824 | ret = ftrace_event_open(inode, file, seq_ops); |
1825 | if (ret < 0) | |
1826 | trace_array_put(tr); | |
1827 | return ret; | |
ae63b31e SR |
1828 | } |
1829 | ||
49090107 SRRH |
1830 | static int |
1831 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1832 | { | |
1833 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1834 | struct trace_array *tr = inode->i_private; | |
1835 | int ret; | |
1836 | ||
1837 | if (trace_array_get(tr) < 0) | |
1838 | return -ENODEV; | |
1839 | ||
1840 | if ((file->f_mode & FMODE_WRITE) && | |
1841 | (file->f_flags & O_TRUNC)) | |
1842 | ftrace_clear_event_pids(tr); | |
1843 | ||
1844 | ret = ftrace_event_open(inode, file, seq_ops); | |
1845 | if (ret < 0) | |
1846 | trace_array_put(tr); | |
1847 | return ret; | |
1848 | } | |
1849 | ||
ae63b31e SR |
1850 | static struct event_subsystem * |
1851 | create_new_subsystem(const char *name) | |
1852 | { | |
1853 | struct event_subsystem *system; | |
1854 | ||
1855 | /* need to create new entry */ | |
1856 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1857 | if (!system) | |
1858 | return NULL; | |
1859 | ||
1860 | system->ref_count = 1; | |
6e94a780 SR |
1861 | |
1862 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1863 | system->name = kstrdup_const(name, GFP_KERNEL); |
1864 | if (!system->name) | |
1865 | goto out_free; | |
ae63b31e SR |
1866 | |
1867 | system->filter = NULL; | |
1868 | ||
1869 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1870 | if (!system->filter) | |
1871 | goto out_free; | |
1872 | ||
1873 | list_add(&system->list, &event_subsystems); | |
1874 | ||
1875 | return system; | |
1876 | ||
1877 | out_free: | |
79ac6ef5 | 1878 | kfree_const(system->name); |
ae63b31e SR |
1879 | kfree(system); |
1880 | return NULL; | |
15075cac SR |
1881 | } |
1882 | ||
6ecc2d1c | 1883 | static struct dentry * |
ae63b31e | 1884 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1885 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1886 | { |
7967b3e0 | 1887 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1888 | struct event_subsystem *system; |
e1112b4d | 1889 | struct dentry *entry; |
6ecc2d1c SR |
1890 | |
1891 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1892 | list_for_each_entry(dir, &tr->systems, list) { |
1893 | system = dir->subsystem; | |
dc82ec98 | 1894 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1895 | dir->nr_events++; |
1896 | file->system = dir; | |
1897 | return dir->entry; | |
dc82ec98 | 1898 | } |
6ecc2d1c SR |
1899 | } |
1900 | ||
ae63b31e SR |
1901 | /* Now see if the system itself exists. */ |
1902 | list_for_each_entry(system, &event_subsystems, list) { | |
1903 | if (strcmp(system->name, name) == 0) | |
1904 | break; | |
6ecc2d1c | 1905 | } |
ae63b31e SR |
1906 | /* Reset system variable when not found */ |
1907 | if (&system->list == &event_subsystems) | |
1908 | system = NULL; | |
6ecc2d1c | 1909 | |
ae63b31e SR |
1910 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1911 | if (!dir) | |
1912 | goto out_fail; | |
6ecc2d1c | 1913 | |
ae63b31e SR |
1914 | if (!system) { |
1915 | system = create_new_subsystem(name); | |
1916 | if (!system) | |
1917 | goto out_free; | |
1918 | } else | |
1919 | __get_system(system); | |
1920 | ||
8434dc93 | 1921 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1922 | if (!dir->entry) { |
3448bac3 | 1923 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1924 | __put_system(system); |
1925 | goto out_free; | |
6d723736 SR |
1926 | } |
1927 | ||
ae63b31e SR |
1928 | dir->tr = tr; |
1929 | dir->ref_count = 1; | |
1930 | dir->nr_events = 1; | |
1931 | dir->subsystem = system; | |
1932 | file->system = dir; | |
8b372562 | 1933 | |
8434dc93 | 1934 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1935 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1936 | if (!entry) { |
1937 | kfree(system->filter); | |
1938 | system->filter = NULL; | |
8434dc93 | 1939 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1940 | } |
e1112b4d | 1941 | |
ae63b31e | 1942 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1943 | &ftrace_system_enable_fops); |
8ae79a13 | 1944 | |
ae63b31e SR |
1945 | list_add(&dir->list, &tr->systems); |
1946 | ||
1947 | return dir->entry; | |
1948 | ||
1949 | out_free: | |
1950 | kfree(dir); | |
1951 | out_fail: | |
1952 | /* Only print this message if failed on memory allocation */ | |
1953 | if (!dir || !system) | |
3448bac3 | 1954 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1955 | return NULL; |
6ecc2d1c SR |
1956 | } |
1957 | ||
1473e441 | 1958 | static int |
7f1d2f82 | 1959 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1960 | { |
2425bcb9 | 1961 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1962 | struct trace_array *tr = file->tr; |
2e33af02 | 1963 | struct list_head *head; |
ae63b31e | 1964 | struct dentry *d_events; |
de7b2973 | 1965 | const char *name; |
fd994989 | 1966 | int ret; |
1473e441 | 1967 | |
6ecc2d1c SR |
1968 | /* |
1969 | * If the trace point header did not define TRACE_SYSTEM | |
1970 | * then the system would be called "TRACE_SYSTEM". | |
1971 | */ | |
ae63b31e SR |
1972 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1973 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1974 | if (!d_events) | |
1975 | return -ENOMEM; | |
1976 | } else | |
1977 | d_events = parent; | |
1978 | ||
687fcc4a | 1979 | name = trace_event_name(call); |
8434dc93 | 1980 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1981 | if (!file->dir) { |
8434dc93 | 1982 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1983 | return -1; |
1984 | } | |
1985 | ||
9b63776f | 1986 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1987 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1988 | &ftrace_enable_fops); |
1473e441 | 1989 | |
2239291a | 1990 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1991 | if (call->event.type && call->class->reg) |
1a11126b | 1992 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1993 | (void *)(long)call->event.type, |
1994 | &ftrace_event_id_fops); | |
2239291a | 1995 | #endif |
23725aee | 1996 | |
c9d932cf LZ |
1997 | /* |
1998 | * Other events may have the same class. Only update | |
1999 | * the fields if they are not already defined. | |
2000 | */ | |
2001 | head = trace_get_fields(call); | |
2002 | if (list_empty(head)) { | |
2003 | ret = call->class->define_fields(call); | |
2004 | if (ret < 0) { | |
3448bac3 FF |
2005 | pr_warn("Could not initialize trace point events/%s\n", |
2006 | name); | |
ae63b31e | 2007 | return -1; |
cf027f64 TZ |
2008 | } |
2009 | } | |
f306cc82 | 2010 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 2011 | &ftrace_event_filter_fops); |
cf027f64 | 2012 | |
854145e0 CH |
2013 | /* |
2014 | * Only event directories that can be enabled should have | |
2015 | * triggers. | |
2016 | */ | |
2017 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
2018 | trace_create_file("trigger", 0644, file->dir, file, | |
2019 | &event_trigger_fops); | |
85f2b082 | 2020 | |
7ef224d1 TZ |
2021 | #ifdef CONFIG_HIST_TRIGGERS |
2022 | trace_create_file("hist", 0444, file->dir, file, | |
2023 | &event_hist_fops); | |
2024 | #endif | |
ae63b31e | 2025 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2026 | &ftrace_event_format_fops); |
6d723736 SR |
2027 | |
2028 | return 0; | |
2029 | } | |
2030 | ||
2425bcb9 | 2031 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2032 | { |
7f1d2f82 | 2033 | struct trace_event_file *file; |
ae63b31e SR |
2034 | struct trace_array *tr; |
2035 | ||
2036 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2037 | if (file->event_call != call) |
2038 | continue; | |
2039 | ||
f6a84bdc | 2040 | remove_event_file_dir(file); |
ae63b31e SR |
2041 | /* |
2042 | * The do_for_each_event_file_safe() is | |
2043 | * a double loop. After finding the call for this | |
2044 | * trace_array, we use break to jump to the next | |
2045 | * trace_array. | |
2046 | */ | |
2047 | break; | |
2048 | } while_for_each_event_file(); | |
2049 | } | |
2050 | ||
2425bcb9 | 2051 | static void event_remove(struct trace_event_call *call) |
8781915a | 2052 | { |
ae63b31e | 2053 | struct trace_array *tr; |
7f1d2f82 | 2054 | struct trace_event_file *file; |
ae63b31e SR |
2055 | |
2056 | do_for_each_event_file(tr, file) { | |
2057 | if (file->event_call != call) | |
2058 | continue; | |
2059 | ftrace_event_enable_disable(file, 0); | |
2060 | /* | |
2061 | * The do_for_each_event_file() is | |
2062 | * a double loop. After finding the call for this | |
2063 | * trace_array, we use break to jump to the next | |
2064 | * trace_array. | |
2065 | */ | |
2066 | break; | |
2067 | } while_for_each_event_file(); | |
2068 | ||
8781915a | 2069 | if (call->event.funcs) |
9023c930 | 2070 | __unregister_trace_event(&call->event); |
ae63b31e | 2071 | remove_event_from_tracers(call); |
8781915a EG |
2072 | list_del(&call->list); |
2073 | } | |
2074 | ||
2425bcb9 | 2075 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2076 | { |
2077 | int ret = 0; | |
de7b2973 | 2078 | const char *name; |
8781915a | 2079 | |
687fcc4a | 2080 | name = trace_event_name(call); |
de7b2973 | 2081 | if (WARN_ON(!name)) |
8781915a EG |
2082 | return -EINVAL; |
2083 | ||
2084 | if (call->class->raw_init) { | |
2085 | ret = call->class->raw_init(call); | |
2086 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2087 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2088 | } |
2089 | ||
2090 | return ret; | |
2091 | } | |
2092 | ||
67ead0a6 | 2093 | static int |
2425bcb9 | 2094 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2095 | { |
bd1a5c84 | 2096 | int ret; |
6d723736 | 2097 | |
8781915a EG |
2098 | ret = event_init(call); |
2099 | if (ret < 0) | |
2100 | return ret; | |
701970b3 | 2101 | |
ae63b31e | 2102 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2103 | call->mod = mod; |
88f70d75 | 2104 | |
ae63b31e | 2105 | return 0; |
bd1a5c84 MH |
2106 | } |
2107 | ||
0c564a53 SRRH |
2108 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
2109 | { | |
2110 | int rlen; | |
2111 | int elen; | |
2112 | ||
2113 | /* Find the length of the enum value as a string */ | |
2114 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
2115 | /* Make sure there's enough room to replace the string with the value */ | |
2116 | if (len < elen) | |
2117 | return NULL; | |
2118 | ||
2119 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
2120 | ||
2121 | /* Get the rest of the string of ptr */ | |
2122 | rlen = strlen(ptr + len); | |
2123 | memmove(ptr + elen, ptr + len, rlen); | |
2124 | /* Make sure we end the new string */ | |
2125 | ptr[elen + rlen] = 0; | |
2126 | ||
2127 | return ptr + elen; | |
2128 | } | |
2129 | ||
2425bcb9 | 2130 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
2131 | struct trace_enum_map *map) |
2132 | { | |
2133 | char *ptr; | |
2134 | int quote = 0; | |
2135 | int len = strlen(map->enum_string); | |
2136 | ||
2137 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2138 | if (*ptr == '\\') { | |
2139 | ptr++; | |
2140 | /* paranoid */ | |
2141 | if (!*ptr) | |
2142 | break; | |
2143 | continue; | |
2144 | } | |
2145 | if (*ptr == '"') { | |
2146 | quote ^= 1; | |
2147 | continue; | |
2148 | } | |
2149 | if (quote) | |
2150 | continue; | |
2151 | if (isdigit(*ptr)) { | |
2152 | /* skip numbers */ | |
2153 | do { | |
2154 | ptr++; | |
2155 | /* Check for alpha chars like ULL */ | |
2156 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2157 | if (!*ptr) |
2158 | break; | |
0c564a53 SRRH |
2159 | /* |
2160 | * A number must have some kind of delimiter after | |
2161 | * it, and we can ignore that too. | |
2162 | */ | |
2163 | continue; | |
2164 | } | |
2165 | if (isalpha(*ptr) || *ptr == '_') { | |
2166 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
2167 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
2168 | ptr = enum_replace(ptr, map, len); | |
2169 | /* Hmm, enum string smaller than value */ | |
2170 | if (WARN_ON_ONCE(!ptr)) | |
2171 | return; | |
2172 | /* | |
2173 | * No need to decrement here, as enum_replace() | |
2174 | * returns the pointer to the character passed | |
2175 | * the enum, and two enums can not be placed | |
2176 | * back to back without something in between. | |
2177 | * We can skip that something in between. | |
2178 | */ | |
2179 | continue; | |
2180 | } | |
2181 | skip_more: | |
2182 | do { | |
2183 | ptr++; | |
2184 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2185 | if (!*ptr) |
2186 | break; | |
0c564a53 SRRH |
2187 | /* |
2188 | * If what comes after this variable is a '.' or | |
2189 | * '->' then we can continue to ignore that string. | |
2190 | */ | |
2191 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2192 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2193 | if (!*ptr) |
2194 | break; | |
0c564a53 SRRH |
2195 | goto skip_more; |
2196 | } | |
2197 | /* | |
2198 | * Once again, we can skip the delimiter that came | |
2199 | * after the string. | |
2200 | */ | |
2201 | continue; | |
2202 | } | |
2203 | } | |
2204 | } | |
2205 | ||
2206 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
2207 | { | |
2425bcb9 | 2208 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
2209 | const char *last_system = NULL; |
2210 | int last_i; | |
2211 | int i; | |
2212 | ||
2213 | down_write(&trace_event_sem); | |
2214 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2215 | /* events are usually grouped together with systems */ | |
2216 | if (!last_system || call->class->system != last_system) { | |
2217 | last_i = 0; | |
2218 | last_system = call->class->system; | |
2219 | } | |
2220 | ||
2221 | for (i = last_i; i < len; i++) { | |
2222 | if (call->class->system == map[i]->system) { | |
2223 | /* Save the first system if need be */ | |
2224 | if (!last_i) | |
2225 | last_i = i; | |
2226 | update_event_printk(call, map[i]); | |
2227 | } | |
2228 | } | |
2229 | } | |
2230 | up_write(&trace_event_sem); | |
2231 | } | |
2232 | ||
7f1d2f82 | 2233 | static struct trace_event_file * |
2425bcb9 | 2234 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2235 | struct trace_array *tr) |
2236 | { | |
7f1d2f82 | 2237 | struct trace_event_file *file; |
da511bf3 SRRH |
2238 | |
2239 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2240 | if (!file) | |
2241 | return NULL; | |
2242 | ||
2243 | file->event_call = call; | |
2244 | file->tr = tr; | |
2245 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2246 | atomic_set(&file->tm_ref, 0); |
2247 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2248 | list_add(&file->list, &tr->events); |
2249 | ||
2250 | return file; | |
2251 | } | |
2252 | ||
ae63b31e SR |
2253 | /* Add an event to a trace directory */ |
2254 | static int | |
2425bcb9 | 2255 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2256 | { |
7f1d2f82 | 2257 | struct trace_event_file *file; |
ae63b31e | 2258 | |
da511bf3 | 2259 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2260 | if (!file) |
2261 | return -ENOMEM; | |
2262 | ||
620a30e9 | 2263 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2264 | } |
2265 | ||
77248221 SR |
2266 | /* |
2267 | * Just create a decriptor for early init. A descriptor is required | |
2268 | * for enabling events at boot. We want to enable events before | |
2269 | * the filesystem is initialized. | |
2270 | */ | |
2271 | static __init int | |
2425bcb9 | 2272 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2273 | struct trace_array *tr) |
2274 | { | |
7f1d2f82 | 2275 | struct trace_event_file *file; |
77248221 | 2276 | |
da511bf3 | 2277 | file = trace_create_new_event(call, tr); |
77248221 SR |
2278 | if (!file) |
2279 | return -ENOMEM; | |
2280 | ||
77248221 SR |
2281 | return 0; |
2282 | } | |
2283 | ||
ae63b31e | 2284 | struct ftrace_module_file_ops; |
2425bcb9 | 2285 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2286 | |
bd1a5c84 | 2287 | /* Add an additional event_call dynamically */ |
2425bcb9 | 2288 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
2289 | { |
2290 | int ret; | |
a8227415 | 2291 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2292 | mutex_lock(&event_mutex); |
701970b3 | 2293 | |
ae63b31e SR |
2294 | ret = __register_event(call, NULL); |
2295 | if (ret >= 0) | |
779c5e37 | 2296 | __add_event_to_tracers(call); |
a2ca5e03 | 2297 | |
ae63b31e | 2298 | mutex_unlock(&event_mutex); |
a8227415 | 2299 | mutex_unlock(&trace_types_lock); |
ae63b31e | 2300 | return ret; |
a2ca5e03 FW |
2301 | } |
2302 | ||
4fead8e4 | 2303 | /* |
a8227415 AL |
2304 | * Must be called under locking of trace_types_lock, event_mutex and |
2305 | * trace_event_sem. | |
4fead8e4 | 2306 | */ |
2425bcb9 | 2307 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2308 | { |
8781915a | 2309 | event_remove(call); |
bd1a5c84 | 2310 | trace_destroy_fields(call); |
57375747 ON |
2311 | free_event_filter(call->filter); |
2312 | call->filter = NULL; | |
bd1a5c84 MH |
2313 | } |
2314 | ||
2425bcb9 | 2315 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2316 | { |
2317 | struct trace_array *tr; | |
7f1d2f82 | 2318 | struct trace_event_file *file; |
2816c551 ON |
2319 | |
2320 | #ifdef CONFIG_PERF_EVENTS | |
2321 | if (call->perf_refcount) | |
2322 | return -EBUSY; | |
2323 | #endif | |
2324 | do_for_each_event_file(tr, file) { | |
2325 | if (file->event_call != call) | |
2326 | continue; | |
2327 | /* | |
2328 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2329 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2330 | * TRACE_REG_UNREGISTER. |
2331 | */ | |
5d6ad960 | 2332 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2333 | return -EBUSY; |
2ba64035 SRRH |
2334 | /* |
2335 | * The do_for_each_event_file_safe() is | |
2336 | * a double loop. After finding the call for this | |
2337 | * trace_array, we use break to jump to the next | |
2338 | * trace_array. | |
2339 | */ | |
2816c551 ON |
2340 | break; |
2341 | } while_for_each_event_file(); | |
2342 | ||
2343 | __trace_remove_event_call(call); | |
2344 | ||
2345 | return 0; | |
2346 | } | |
2347 | ||
bd1a5c84 | 2348 | /* Remove an event_call */ |
2425bcb9 | 2349 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2350 | { |
2816c551 ON |
2351 | int ret; |
2352 | ||
a8227415 | 2353 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2354 | mutex_lock(&event_mutex); |
52f6ad6d | 2355 | down_write(&trace_event_sem); |
2816c551 | 2356 | ret = probe_remove_event_call(call); |
52f6ad6d | 2357 | up_write(&trace_event_sem); |
bd1a5c84 | 2358 | mutex_unlock(&event_mutex); |
a8227415 | 2359 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
2360 | |
2361 | return ret; | |
bd1a5c84 MH |
2362 | } |
2363 | ||
2364 | #define for_each_event(event, start, end) \ | |
2365 | for (event = start; \ | |
2366 | (unsigned long)event < (unsigned long)end; \ | |
2367 | event++) | |
2368 | ||
2369 | #ifdef CONFIG_MODULES | |
2370 | ||
6d723736 SR |
2371 | static void trace_module_add_events(struct module *mod) |
2372 | { | |
2425bcb9 | 2373 | struct trace_event_call **call, **start, **end; |
6d723736 | 2374 | |
45ab2813 SRRH |
2375 | if (!mod->num_trace_events) |
2376 | return; | |
2377 | ||
2378 | /* Don't add infrastructure for mods without tracepoints */ | |
2379 | if (trace_module_has_bad_taint(mod)) { | |
2380 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2381 | mod->name); | |
2382 | return; | |
2383 | } | |
2384 | ||
6d723736 SR |
2385 | start = mod->trace_events; |
2386 | end = mod->trace_events + mod->num_trace_events; | |
2387 | ||
6d723736 | 2388 | for_each_event(call, start, end) { |
ae63b31e | 2389 | __register_event(*call, mod); |
779c5e37 | 2390 | __add_event_to_tracers(*call); |
6d723736 SR |
2391 | } |
2392 | } | |
2393 | ||
2394 | static void trace_module_remove_events(struct module *mod) | |
2395 | { | |
2425bcb9 | 2396 | struct trace_event_call *call, *p; |
575380da | 2397 | bool clear_trace = false; |
6d723736 | 2398 | |
52f6ad6d | 2399 | down_write(&trace_event_sem); |
6d723736 SR |
2400 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2401 | if (call->mod == mod) { | |
575380da SRRH |
2402 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2403 | clear_trace = true; | |
bd1a5c84 | 2404 | __trace_remove_event_call(call); |
6d723736 SR |
2405 | } |
2406 | } | |
52f6ad6d | 2407 | up_write(&trace_event_sem); |
9456f0fa SR |
2408 | |
2409 | /* | |
2410 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2411 | * registered any events that were used. The only worry is if |
2412 | * a new module gets loaded, and takes on the same id as the events | |
2413 | * of this module. When printing out the buffer, traced events left | |
2414 | * over from this module may be passed to the new module events and | |
2415 | * unexpected results may occur. | |
9456f0fa | 2416 | */ |
575380da | 2417 | if (clear_trace) |
873c642f | 2418 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2419 | } |
2420 | ||
61f919a1 SR |
2421 | static int trace_module_notify(struct notifier_block *self, |
2422 | unsigned long val, void *data) | |
6d723736 SR |
2423 | { |
2424 | struct module *mod = data; | |
2425 | ||
a8227415 | 2426 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2427 | mutex_lock(&event_mutex); |
2428 | switch (val) { | |
2429 | case MODULE_STATE_COMING: | |
2430 | trace_module_add_events(mod); | |
2431 | break; | |
2432 | case MODULE_STATE_GOING: | |
2433 | trace_module_remove_events(mod); | |
2434 | break; | |
2435 | } | |
2436 | mutex_unlock(&event_mutex); | |
a8227415 | 2437 | mutex_unlock(&trace_types_lock); |
fd994989 | 2438 | |
1473e441 SR |
2439 | return 0; |
2440 | } | |
315326c1 | 2441 | |
836d481e ON |
2442 | static struct notifier_block trace_module_nb = { |
2443 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2444 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2445 | }; |
61f919a1 | 2446 | #endif /* CONFIG_MODULES */ |
1473e441 | 2447 | |
ae63b31e SR |
2448 | /* Create a new event directory structure for a trace directory. */ |
2449 | static void | |
2450 | __trace_add_event_dirs(struct trace_array *tr) | |
2451 | { | |
2425bcb9 | 2452 | struct trace_event_call *call; |
ae63b31e SR |
2453 | int ret; |
2454 | ||
2455 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2456 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2457 | if (ret < 0) |
3448bac3 | 2458 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2459 | trace_event_name(call)); |
ae63b31e SR |
2460 | } |
2461 | } | |
2462 | ||
7f1d2f82 | 2463 | struct trace_event_file * |
3cd715de SRRH |
2464 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2465 | { | |
7f1d2f82 | 2466 | struct trace_event_file *file; |
2425bcb9 | 2467 | struct trace_event_call *call; |
de7b2973 | 2468 | const char *name; |
3cd715de SRRH |
2469 | |
2470 | list_for_each_entry(file, &tr->events, list) { | |
2471 | ||
2472 | call = file->event_call; | |
687fcc4a | 2473 | name = trace_event_name(call); |
3cd715de | 2474 | |
de7b2973 | 2475 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2476 | continue; |
2477 | ||
2478 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2479 | continue; | |
2480 | ||
de7b2973 | 2481 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2482 | strcmp(system, call->class->system) == 0) |
2483 | return file; | |
2484 | } | |
2485 | return NULL; | |
2486 | } | |
2487 | ||
2875a08b SRRH |
2488 | #ifdef CONFIG_DYNAMIC_FTRACE |
2489 | ||
2490 | /* Avoid typos */ | |
2491 | #define ENABLE_EVENT_STR "enable_event" | |
2492 | #define DISABLE_EVENT_STR "disable_event" | |
2493 | ||
2494 | struct event_probe_data { | |
7f1d2f82 | 2495 | struct trace_event_file *file; |
2875a08b SRRH |
2496 | unsigned long count; |
2497 | int ref; | |
2498 | bool enable; | |
2499 | }; | |
2500 | ||
3cd715de SRRH |
2501 | static void |
2502 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2503 | { | |
2504 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2505 | struct event_probe_data *data = *pdata; | |
2506 | ||
2507 | if (!data) | |
2508 | return; | |
2509 | ||
2510 | if (data->enable) | |
5d6ad960 | 2511 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2512 | else |
5d6ad960 | 2513 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2514 | } |
2515 | ||
2516 | static void | |
2517 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2518 | { | |
2519 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2520 | struct event_probe_data *data = *pdata; | |
2521 | ||
2522 | if (!data) | |
2523 | return; | |
2524 | ||
2525 | if (!data->count) | |
2526 | return; | |
2527 | ||
2528 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2529 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2530 | return; |
2531 | ||
2532 | if (data->count != -1) | |
2533 | (data->count)--; | |
2534 | ||
2535 | event_enable_probe(ip, parent_ip, _data); | |
2536 | } | |
2537 | ||
2538 | static int | |
2539 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2540 | struct ftrace_probe_ops *ops, void *_data) | |
2541 | { | |
2542 | struct event_probe_data *data = _data; | |
2543 | ||
2544 | seq_printf(m, "%ps:", (void *)ip); | |
2545 | ||
2546 | seq_printf(m, "%s:%s:%s", | |
2547 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2548 | data->file->event_call->class->system, | |
687fcc4a | 2549 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2550 | |
2551 | if (data->count == -1) | |
fa6f0cc7 | 2552 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2553 | else |
2554 | seq_printf(m, ":count=%ld\n", data->count); | |
2555 | ||
2556 | return 0; | |
2557 | } | |
2558 | ||
2559 | static int | |
2560 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2561 | void **_data) | |
2562 | { | |
2563 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2564 | struct event_probe_data *data = *pdata; | |
2565 | ||
2566 | data->ref++; | |
2567 | return 0; | |
2568 | } | |
2569 | ||
2570 | static void | |
2571 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2572 | void **_data) | |
2573 | { | |
2574 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2575 | struct event_probe_data *data = *pdata; | |
2576 | ||
2577 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2578 | return; | |
2579 | ||
2580 | data->ref--; | |
2581 | if (!data->ref) { | |
2582 | /* Remove the SOFT_MODE flag */ | |
2583 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2584 | module_put(data->file->event_call->mod); | |
2585 | kfree(data); | |
2586 | } | |
2587 | *pdata = NULL; | |
2588 | } | |
2589 | ||
2590 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2591 | .func = event_enable_probe, | |
2592 | .print = event_enable_print, | |
2593 | .init = event_enable_init, | |
2594 | .free = event_enable_free, | |
2595 | }; | |
2596 | ||
2597 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2598 | .func = event_enable_count_probe, | |
2599 | .print = event_enable_print, | |
2600 | .init = event_enable_init, | |
2601 | .free = event_enable_free, | |
2602 | }; | |
2603 | ||
2604 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2605 | .func = event_enable_probe, | |
2606 | .print = event_enable_print, | |
2607 | .init = event_enable_init, | |
2608 | .free = event_enable_free, | |
2609 | }; | |
2610 | ||
2611 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2612 | .func = event_enable_count_probe, | |
2613 | .print = event_enable_print, | |
2614 | .init = event_enable_init, | |
2615 | .free = event_enable_free, | |
2616 | }; | |
2617 | ||
2618 | static int | |
2619 | event_enable_func(struct ftrace_hash *hash, | |
2620 | char *glob, char *cmd, char *param, int enabled) | |
2621 | { | |
2622 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2623 | struct trace_event_file *file; |
3cd715de SRRH |
2624 | struct ftrace_probe_ops *ops; |
2625 | struct event_probe_data *data; | |
2626 | const char *system; | |
2627 | const char *event; | |
2628 | char *number; | |
2629 | bool enable; | |
2630 | int ret; | |
2631 | ||
dc81e5e3 YY |
2632 | if (!tr) |
2633 | return -ENODEV; | |
2634 | ||
3cd715de | 2635 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2636 | if (!enabled || !param) |
3cd715de SRRH |
2637 | return -EINVAL; |
2638 | ||
2639 | system = strsep(¶m, ":"); | |
2640 | if (!param) | |
2641 | return -EINVAL; | |
2642 | ||
2643 | event = strsep(¶m, ":"); | |
2644 | ||
2645 | mutex_lock(&event_mutex); | |
2646 | ||
2647 | ret = -EINVAL; | |
2648 | file = find_event_file(tr, system, event); | |
2649 | if (!file) | |
2650 | goto out; | |
2651 | ||
2652 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2653 | ||
2654 | if (enable) | |
2655 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2656 | else | |
2657 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2658 | ||
2659 | if (glob[0] == '!') { | |
2660 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2661 | ret = 0; | |
2662 | goto out; | |
2663 | } | |
2664 | ||
2665 | ret = -ENOMEM; | |
2666 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2667 | if (!data) | |
2668 | goto out; | |
2669 | ||
2670 | data->enable = enable; | |
2671 | data->count = -1; | |
2672 | data->file = file; | |
2673 | ||
2674 | if (!param) | |
2675 | goto out_reg; | |
2676 | ||
2677 | number = strsep(¶m, ":"); | |
2678 | ||
2679 | ret = -EINVAL; | |
2680 | if (!strlen(number)) | |
2681 | goto out_free; | |
2682 | ||
2683 | /* | |
2684 | * We use the callback data field (which is a pointer) | |
2685 | * as our counter. | |
2686 | */ | |
2687 | ret = kstrtoul(number, 0, &data->count); | |
2688 | if (ret) | |
2689 | goto out_free; | |
2690 | ||
2691 | out_reg: | |
2692 | /* Don't let event modules unload while probe registered */ | |
2693 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2694 | if (!ret) { |
2695 | ret = -EBUSY; | |
3cd715de | 2696 | goto out_free; |
6ed01066 | 2697 | } |
3cd715de SRRH |
2698 | |
2699 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2700 | if (ret < 0) | |
2701 | goto out_put; | |
2702 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2703 | /* |
2704 | * The above returns on success the # of functions enabled, | |
2705 | * but if it didn't find any functions it returns zero. | |
2706 | * Consider no functions a failure too. | |
2707 | */ | |
a5b85bd1 MH |
2708 | if (!ret) { |
2709 | ret = -ENOENT; | |
3cd715de | 2710 | goto out_disable; |
ff305ded SRRH |
2711 | } else if (ret < 0) |
2712 | goto out_disable; | |
2713 | /* Just return zero, not the number of enabled functions */ | |
2714 | ret = 0; | |
3cd715de SRRH |
2715 | out: |
2716 | mutex_unlock(&event_mutex); | |
2717 | return ret; | |
2718 | ||
2719 | out_disable: | |
2720 | __ftrace_event_enable_disable(file, 0, 1); | |
2721 | out_put: | |
2722 | module_put(file->event_call->mod); | |
2723 | out_free: | |
2724 | kfree(data); | |
2725 | goto out; | |
2726 | } | |
2727 | ||
2728 | static struct ftrace_func_command event_enable_cmd = { | |
2729 | .name = ENABLE_EVENT_STR, | |
2730 | .func = event_enable_func, | |
2731 | }; | |
2732 | ||
2733 | static struct ftrace_func_command event_disable_cmd = { | |
2734 | .name = DISABLE_EVENT_STR, | |
2735 | .func = event_enable_func, | |
2736 | }; | |
2737 | ||
2738 | static __init int register_event_cmds(void) | |
2739 | { | |
2740 | int ret; | |
2741 | ||
2742 | ret = register_ftrace_command(&event_enable_cmd); | |
2743 | if (WARN_ON(ret < 0)) | |
2744 | return ret; | |
2745 | ret = register_ftrace_command(&event_disable_cmd); | |
2746 | if (WARN_ON(ret < 0)) | |
2747 | unregister_ftrace_command(&event_enable_cmd); | |
2748 | return ret; | |
2749 | } | |
2750 | #else | |
2751 | static inline int register_event_cmds(void) { return 0; } | |
2752 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2753 | ||
77248221 | 2754 | /* |
7f1d2f82 | 2755 | * The top level array has already had its trace_event_file |
77248221 | 2756 | * descriptors created in order to allow for early events to |
8434dc93 | 2757 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2758 | * initialized, and we now have to create the files associated |
2759 | * to the events. | |
2760 | */ | |
2761 | static __init void | |
2762 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2763 | { | |
7f1d2f82 | 2764 | struct trace_event_file *file; |
77248221 SR |
2765 | int ret; |
2766 | ||
2767 | ||
2768 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2769 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2770 | if (ret < 0) |
3448bac3 | 2771 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2772 | trace_event_name(file->event_call)); |
77248221 SR |
2773 | } |
2774 | } | |
2775 | ||
2776 | /* | |
2777 | * For early boot up, the top trace array requires to have | |
2778 | * a list of events that can be enabled. This must be done before | |
2779 | * the filesystem is set up in order to allow events to be traced | |
2780 | * early. | |
2781 | */ | |
2782 | static __init void | |
2783 | __trace_early_add_events(struct trace_array *tr) | |
2784 | { | |
2425bcb9 | 2785 | struct trace_event_call *call; |
77248221 SR |
2786 | int ret; |
2787 | ||
2788 | list_for_each_entry(call, &ftrace_events, list) { | |
2789 | /* Early boot up should not have any modules loaded */ | |
2790 | if (WARN_ON_ONCE(call->mod)) | |
2791 | continue; | |
2792 | ||
2793 | ret = __trace_early_add_new_event(call, tr); | |
2794 | if (ret < 0) | |
3448bac3 | 2795 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2796 | trace_event_name(call)); |
77248221 SR |
2797 | } |
2798 | } | |
2799 | ||
0c8916c3 SR |
2800 | /* Remove the event directory structure for a trace directory. */ |
2801 | static void | |
2802 | __trace_remove_event_dirs(struct trace_array *tr) | |
2803 | { | |
7f1d2f82 | 2804 | struct trace_event_file *file, *next; |
0c8916c3 | 2805 | |
f6a84bdc ON |
2806 | list_for_each_entry_safe(file, next, &tr->events, list) |
2807 | remove_event_file_dir(file); | |
0c8916c3 SR |
2808 | } |
2809 | ||
2425bcb9 | 2810 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2811 | { |
2812 | struct trace_array *tr; | |
2813 | ||
620a30e9 ON |
2814 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2815 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2816 | } |
2817 | ||
2425bcb9 SRRH |
2818 | extern struct trace_event_call *__start_ftrace_events[]; |
2819 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2820 | |
020e5f85 LZ |
2821 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2822 | ||
2823 | static __init int setup_trace_event(char *str) | |
2824 | { | |
2825 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2826 | ring_buffer_expanded = true; |
2827 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2828 | |
2829 | return 1; | |
2830 | } | |
2831 | __setup("trace_event=", setup_trace_event); | |
2832 | ||
77248221 SR |
2833 | /* Expects to have event_mutex held when called */ |
2834 | static int | |
2835 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2836 | { |
2837 | struct dentry *d_events; | |
2838 | struct dentry *entry; | |
2839 | ||
8434dc93 | 2840 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2841 | tr, &ftrace_set_event_fops); |
2842 | if (!entry) { | |
8434dc93 | 2843 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2844 | return -ENOMEM; |
2845 | } | |
2846 | ||
8434dc93 | 2847 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2848 | if (!d_events) { |
8434dc93 | 2849 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2850 | return -ENOMEM; |
2851 | } | |
ae63b31e | 2852 | |
49090107 SRRH |
2853 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2854 | tr, &ftrace_set_event_pid_fops); | |
2855 | ||
ae63b31e SR |
2856 | /* ring buffer internal formats */ |
2857 | trace_create_file("header_page", 0444, d_events, | |
2858 | ring_buffer_print_page_header, | |
2859 | &ftrace_show_header_fops); | |
2860 | ||
2861 | trace_create_file("header_event", 0444, d_events, | |
2862 | ring_buffer_print_entry_header, | |
2863 | &ftrace_show_header_fops); | |
2864 | ||
2865 | trace_create_file("enable", 0644, d_events, | |
2866 | tr, &ftrace_tr_enable_fops); | |
2867 | ||
2868 | tr->event_dir = d_events; | |
77248221 SR |
2869 | |
2870 | return 0; | |
2871 | } | |
2872 | ||
2873 | /** | |
2874 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2875 | * @parent: The parent dentry to place the files/directories for events in | |
2876 | * @tr: The trace array associated with these events | |
2877 | * | |
2878 | * When a new instance is created, it needs to set up its events | |
2879 | * directory, as well as other files associated with events. It also | |
2880 | * creates the event hierachry in the @parent/events directory. | |
2881 | * | |
2882 | * Returns 0 on success. | |
2883 | */ | |
2884 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2885 | { | |
2886 | int ret; | |
2887 | ||
2888 | mutex_lock(&event_mutex); | |
2889 | ||
2890 | ret = create_event_toplevel_files(parent, tr); | |
2891 | if (ret) | |
2892 | goto out_unlock; | |
2893 | ||
52f6ad6d | 2894 | down_write(&trace_event_sem); |
ae63b31e | 2895 | __trace_add_event_dirs(tr); |
52f6ad6d | 2896 | up_write(&trace_event_sem); |
277ba044 | 2897 | |
77248221 | 2898 | out_unlock: |
277ba044 | 2899 | mutex_unlock(&event_mutex); |
ae63b31e | 2900 | |
77248221 SR |
2901 | return ret; |
2902 | } | |
2903 | ||
2904 | /* | |
2905 | * The top trace array already had its file descriptors created. | |
2906 | * Now the files themselves need to be created. | |
2907 | */ | |
2908 | static __init int | |
2909 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2910 | { | |
2911 | int ret; | |
2912 | ||
2913 | mutex_lock(&event_mutex); | |
2914 | ||
2915 | ret = create_event_toplevel_files(parent, tr); | |
2916 | if (ret) | |
2917 | goto out_unlock; | |
2918 | ||
52f6ad6d | 2919 | down_write(&trace_event_sem); |
77248221 | 2920 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2921 | up_write(&trace_event_sem); |
77248221 SR |
2922 | |
2923 | out_unlock: | |
2924 | mutex_unlock(&event_mutex); | |
2925 | ||
2926 | return ret; | |
ae63b31e SR |
2927 | } |
2928 | ||
0c8916c3 SR |
2929 | int event_trace_del_tracer(struct trace_array *tr) |
2930 | { | |
0c8916c3 SR |
2931 | mutex_lock(&event_mutex); |
2932 | ||
85f2b082 TZ |
2933 | /* Disable any event triggers and associated soft-disabled events */ |
2934 | clear_event_triggers(tr); | |
2935 | ||
49090107 SRRH |
2936 | /* Clear the pid list */ |
2937 | __ftrace_clear_event_pids(tr); | |
2938 | ||
2a6c24af SRRH |
2939 | /* Disable any running events */ |
2940 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2941 | ||
3ccb0123 SR |
2942 | /* Access to events are within rcu_read_lock_sched() */ |
2943 | synchronize_sched(); | |
2944 | ||
52f6ad6d | 2945 | down_write(&trace_event_sem); |
0c8916c3 | 2946 | __trace_remove_event_dirs(tr); |
8434dc93 | 2947 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 2948 | up_write(&trace_event_sem); |
0c8916c3 SR |
2949 | |
2950 | tr->event_dir = NULL; | |
2951 | ||
2952 | mutex_unlock(&event_mutex); | |
2953 | ||
2954 | return 0; | |
2955 | } | |
2956 | ||
d1a29143 SR |
2957 | static __init int event_trace_memsetup(void) |
2958 | { | |
2959 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 2960 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
2961 | return 0; |
2962 | } | |
2963 | ||
ce1039bd SRRH |
2964 | static __init void |
2965 | early_enable_events(struct trace_array *tr, bool disable_first) | |
2966 | { | |
2967 | char *buf = bootup_event_buf; | |
2968 | char *token; | |
2969 | int ret; | |
2970 | ||
2971 | while (true) { | |
2972 | token = strsep(&buf, ","); | |
2973 | ||
2974 | if (!token) | |
2975 | break; | |
ce1039bd | 2976 | |
43ed3843 SRRH |
2977 | if (*token) { |
2978 | /* Restarting syscalls requires that we stop them first */ | |
2979 | if (disable_first) | |
2980 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 2981 | |
43ed3843 SRRH |
2982 | ret = ftrace_set_clr_event(tr, token, 1); |
2983 | if (ret) | |
2984 | pr_warn("Failed to enable trace event: %s\n", token); | |
2985 | } | |
ce1039bd SRRH |
2986 | |
2987 | /* Put back the comma to allow this to be called again */ | |
2988 | if (buf) | |
2989 | *(buf - 1) = ','; | |
2990 | } | |
2991 | } | |
2992 | ||
8781915a EG |
2993 | static __init int event_trace_enable(void) |
2994 | { | |
ae63b31e | 2995 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 2996 | struct trace_event_call **iter, *call; |
8781915a EG |
2997 | int ret; |
2998 | ||
dc81e5e3 YY |
2999 | if (!tr) |
3000 | return -ENODEV; | |
3001 | ||
8781915a EG |
3002 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3003 | ||
3004 | call = *iter; | |
3005 | ret = event_init(call); | |
3006 | if (!ret) | |
3007 | list_add(&call->list, &ftrace_events); | |
3008 | } | |
3009 | ||
77248221 SR |
3010 | /* |
3011 | * We need the top trace array to have a working set of trace | |
3012 | * points at early init, before the debug files and directories | |
3013 | * are created. Create the file entries now, and attach them | |
3014 | * to the actual file dentries later. | |
3015 | */ | |
3016 | __trace_early_add_events(tr); | |
3017 | ||
ce1039bd | 3018 | early_enable_events(tr, false); |
81698831 SR |
3019 | |
3020 | trace_printk_start_comm(); | |
3021 | ||
3cd715de SRRH |
3022 | register_event_cmds(); |
3023 | ||
85f2b082 TZ |
3024 | register_trigger_cmds(); |
3025 | ||
8781915a EG |
3026 | return 0; |
3027 | } | |
3028 | ||
ce1039bd SRRH |
3029 | /* |
3030 | * event_trace_enable() is called from trace_event_init() first to | |
3031 | * initialize events and perhaps start any events that are on the | |
3032 | * command line. Unfortunately, there are some events that will not | |
3033 | * start this early, like the system call tracepoints that need | |
3034 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3035 | * is called before pid 1 starts, and this flag is never set, making | |
3036 | * the syscall tracepoint never get reached, but the event is enabled | |
3037 | * regardless (and not doing anything). | |
3038 | */ | |
3039 | static __init int event_trace_enable_again(void) | |
3040 | { | |
3041 | struct trace_array *tr; | |
3042 | ||
3043 | tr = top_trace_array(); | |
3044 | if (!tr) | |
3045 | return -ENODEV; | |
3046 | ||
3047 | early_enable_events(tr, true); | |
3048 | ||
3049 | return 0; | |
3050 | } | |
3051 | ||
3052 | early_initcall(event_trace_enable_again); | |
3053 | ||
b77e38aa SR |
3054 | static __init int event_trace_init(void) |
3055 | { | |
ae63b31e | 3056 | struct trace_array *tr; |
b77e38aa SR |
3057 | struct dentry *d_tracer; |
3058 | struct dentry *entry; | |
6d723736 | 3059 | int ret; |
b77e38aa | 3060 | |
ae63b31e | 3061 | tr = top_trace_array(); |
dc81e5e3 YY |
3062 | if (!tr) |
3063 | return -ENODEV; | |
ae63b31e | 3064 | |
b77e38aa | 3065 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3066 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3067 | return 0; |
3068 | ||
8434dc93 | 3069 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3070 | tr, &ftrace_avail_fops); |
2314c4ae | 3071 | if (!entry) |
8434dc93 | 3072 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3073 | |
9f616680 DW |
3074 | if (trace_define_generic_fields()) |
3075 | pr_warn("tracing: Failed to allocated generic fields"); | |
3076 | ||
8728fe50 | 3077 | if (trace_define_common_fields()) |
3448bac3 | 3078 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3079 | |
77248221 | 3080 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3081 | if (ret) |
3082 | return ret; | |
020e5f85 | 3083 | |
836d481e | 3084 | #ifdef CONFIG_MODULES |
6d723736 | 3085 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3086 | if (ret) |
3448bac3 | 3087 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3088 | #endif |
b77e38aa SR |
3089 | return 0; |
3090 | } | |
5f893b26 SRRH |
3091 | |
3092 | void __init trace_event_init(void) | |
3093 | { | |
3094 | event_trace_memsetup(); | |
3095 | init_ftrace_syscalls(); | |
3096 | event_trace_enable(); | |
3097 | } | |
3098 | ||
b77e38aa | 3099 | fs_initcall(event_trace_init); |
e6187007 SR |
3100 | |
3101 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
3102 | ||
3103 | static DEFINE_SPINLOCK(test_spinlock); | |
3104 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3105 | static DEFINE_MUTEX(test_mutex); | |
3106 | ||
3107 | static __init void test_work(struct work_struct *dummy) | |
3108 | { | |
3109 | spin_lock(&test_spinlock); | |
3110 | spin_lock_irq(&test_spinlock_irq); | |
3111 | udelay(1); | |
3112 | spin_unlock_irq(&test_spinlock_irq); | |
3113 | spin_unlock(&test_spinlock); | |
3114 | ||
3115 | mutex_lock(&test_mutex); | |
3116 | msleep(1); | |
3117 | mutex_unlock(&test_mutex); | |
3118 | } | |
3119 | ||
3120 | static __init int event_test_thread(void *unused) | |
3121 | { | |
3122 | void *test_malloc; | |
3123 | ||
3124 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3125 | if (!test_malloc) | |
3126 | pr_info("failed to kmalloc\n"); | |
3127 | ||
3128 | schedule_on_each_cpu(test_work); | |
3129 | ||
3130 | kfree(test_malloc); | |
3131 | ||
3132 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3133 | while (!kthread_should_stop()) { |
e6187007 | 3134 | schedule(); |
fe0e01c7 PZ |
3135 | set_current_state(TASK_INTERRUPTIBLE); |
3136 | } | |
3137 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3138 | |
3139 | return 0; | |
3140 | } | |
3141 | ||
3142 | /* | |
3143 | * Do various things that may trigger events. | |
3144 | */ | |
3145 | static __init void event_test_stuff(void) | |
3146 | { | |
3147 | struct task_struct *test_thread; | |
3148 | ||
3149 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3150 | msleep(1); | |
3151 | kthread_stop(test_thread); | |
3152 | } | |
3153 | ||
3154 | /* | |
3155 | * For every trace event defined, we will test each trace point separately, | |
3156 | * and then by groups, and finally all trace points. | |
3157 | */ | |
9ea21c1e | 3158 | static __init void event_trace_self_tests(void) |
e6187007 | 3159 | { |
7967b3e0 | 3160 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3161 | struct trace_event_file *file; |
2425bcb9 | 3162 | struct trace_event_call *call; |
e6187007 | 3163 | struct event_subsystem *system; |
ae63b31e | 3164 | struct trace_array *tr; |
e6187007 SR |
3165 | int ret; |
3166 | ||
ae63b31e | 3167 | tr = top_trace_array(); |
dc81e5e3 YY |
3168 | if (!tr) |
3169 | return; | |
ae63b31e | 3170 | |
e6187007 SR |
3171 | pr_info("Running tests on trace events:\n"); |
3172 | ||
ae63b31e SR |
3173 | list_for_each_entry(file, &tr->events, list) { |
3174 | ||
3175 | call = file->event_call; | |
e6187007 | 3176 | |
2239291a SR |
3177 | /* Only test those that have a probe */ |
3178 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3179 | continue; |
3180 | ||
1f5a6b45 SR |
3181 | /* |
3182 | * Testing syscall events here is pretty useless, but | |
3183 | * we still do it if configured. But this is time consuming. | |
3184 | * What we really need is a user thread to perform the | |
3185 | * syscalls as we test. | |
3186 | */ | |
3187 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3188 | if (call->class->system && |
3189 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3190 | continue; |
3191 | #endif | |
3192 | ||
687fcc4a | 3193 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3194 | |
3195 | /* | |
3196 | * If an event is already enabled, someone is using | |
3197 | * it and the self test should not be on. | |
3198 | */ | |
5d6ad960 | 3199 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3200 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3201 | WARN_ON_ONCE(1); |
3202 | continue; | |
3203 | } | |
3204 | ||
ae63b31e | 3205 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3206 | event_test_stuff(); |
ae63b31e | 3207 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3208 | |
3209 | pr_cont("OK\n"); | |
3210 | } | |
3211 | ||
3212 | /* Now test at the sub system level */ | |
3213 | ||
3214 | pr_info("Running tests on trace event systems:\n"); | |
3215 | ||
ae63b31e SR |
3216 | list_for_each_entry(dir, &tr->systems, list) { |
3217 | ||
3218 | system = dir->subsystem; | |
e6187007 SR |
3219 | |
3220 | /* the ftrace system is special, skip it */ | |
3221 | if (strcmp(system->name, "ftrace") == 0) | |
3222 | continue; | |
3223 | ||
3224 | pr_info("Testing event system %s: ", system->name); | |
3225 | ||
ae63b31e | 3226 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3227 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3228 | pr_warn("error enabling system %s\n", |
3229 | system->name); | |
e6187007 SR |
3230 | continue; |
3231 | } | |
3232 | ||
3233 | event_test_stuff(); | |
3234 | ||
ae63b31e | 3235 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3236 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3237 | pr_warn("error disabling system %s\n", |
3238 | system->name); | |
76bab1b7 YL |
3239 | continue; |
3240 | } | |
e6187007 SR |
3241 | |
3242 | pr_cont("OK\n"); | |
3243 | } | |
3244 | ||
3245 | /* Test with all events enabled */ | |
3246 | ||
3247 | pr_info("Running tests on all trace events:\n"); | |
3248 | pr_info("Testing all events: "); | |
3249 | ||
ae63b31e | 3250 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3251 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3252 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3253 | return; |
e6187007 SR |
3254 | } |
3255 | ||
3256 | event_test_stuff(); | |
3257 | ||
3258 | /* reset sysname */ | |
ae63b31e | 3259 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3260 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3261 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3262 | return; |
e6187007 SR |
3263 | } |
3264 | ||
3265 | pr_cont("OK\n"); | |
9ea21c1e SR |
3266 | } |
3267 | ||
3268 | #ifdef CONFIG_FUNCTION_TRACER | |
3269 | ||
245b2e70 | 3270 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3271 | |
9b9db275 | 3272 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3273 | |
3274 | static void __init | |
2f5f6ad9 | 3275 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3276 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3277 | { |
3278 | struct ring_buffer_event *event; | |
e77405ad | 3279 | struct ring_buffer *buffer; |
9ea21c1e SR |
3280 | struct ftrace_entry *entry; |
3281 | unsigned long flags; | |
3282 | long disabled; | |
9ea21c1e SR |
3283 | int cpu; |
3284 | int pc; | |
3285 | ||
3286 | pc = preempt_count(); | |
5168ae50 | 3287 | preempt_disable_notrace(); |
9ea21c1e | 3288 | cpu = raw_smp_processor_id(); |
245b2e70 | 3289 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3290 | |
3291 | if (disabled != 1) | |
3292 | goto out; | |
3293 | ||
3294 | local_save_flags(flags); | |
3295 | ||
9b9db275 SRRH |
3296 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3297 | TRACE_FN, sizeof(*entry), | |
3298 | flags, pc); | |
9ea21c1e SR |
3299 | if (!event) |
3300 | goto out; | |
3301 | entry = ring_buffer_event_data(event); | |
3302 | entry->ip = ip; | |
3303 | entry->parent_ip = parent_ip; | |
3304 | ||
9b9db275 SRRH |
3305 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3306 | entry, flags, pc); | |
9ea21c1e | 3307 | out: |
245b2e70 | 3308 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3309 | preempt_enable_notrace(); |
9ea21c1e SR |
3310 | } |
3311 | ||
3312 | static struct ftrace_ops trace_ops __initdata = | |
3313 | { | |
3314 | .func = function_test_events_call, | |
4740974a | 3315 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3316 | }; |
3317 | ||
3318 | static __init void event_trace_self_test_with_function(void) | |
3319 | { | |
17bb615a | 3320 | int ret; |
9b9db275 SRRH |
3321 | |
3322 | event_trace_file.tr = top_trace_array(); | |
3323 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3324 | return; |
9b9db275 | 3325 | |
17bb615a SR |
3326 | ret = register_ftrace_function(&trace_ops); |
3327 | if (WARN_ON(ret < 0)) { | |
3328 | pr_info("Failed to enable function tracer for event tests\n"); | |
3329 | return; | |
3330 | } | |
9ea21c1e SR |
3331 | pr_info("Running tests again, along with the function tracer\n"); |
3332 | event_trace_self_tests(); | |
3333 | unregister_ftrace_function(&trace_ops); | |
3334 | } | |
3335 | #else | |
3336 | static __init void event_trace_self_test_with_function(void) | |
3337 | { | |
3338 | } | |
3339 | #endif | |
3340 | ||
3341 | static __init int event_trace_self_tests_init(void) | |
3342 | { | |
020e5f85 LZ |
3343 | if (!tracing_selftest_disabled) { |
3344 | event_trace_self_tests(); | |
3345 | event_trace_self_test_with_function(); | |
3346 | } | |
e6187007 SR |
3347 | |
3348 | return 0; | |
3349 | } | |
3350 | ||
28d20e2d | 3351 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3352 | |
3353 | #endif |